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28 Jul 2026, 07:15
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
55%
(hard)
Question Stats:
60% (01:30) correct
40%
(01:52)
wrong
based on 115
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Radioactive elements may have been created when the universe began. However, even if this occurred, these elements are clearly still being created in the universe today. Radioactive elements are unstable, so most of them decay within at most a few million years into other, nonradioactive elements. So, if no new radioactive elements had been created after the universe began, almost no radioactive elements would be left in the universe today, but there is an abundance of such elements.
Which one of the following most accurately expresses the main conclusion of the argument?
(A) Any radioactive elements created when the universe began have probably decayed into other, nonradioactive elements.
(B) Radioactive elements are being created in the universe today.
(C) If no new radioactive elements had been created after the universe began, almost no radioactive elements would be left in the universe today.
(D) It is possible that radioactive elements were created when the universe began.
(E) Due to their instability, most of the universe's radioactive elements decay within at most a few million years into other, nonradioactive elements.
Which one of the following most accurately expresses the main conclusion of the argument?
(A) Any radioactive elements created when the universe began have probably decayed into other, nonradioactive elements.
(B) Radioactive elements are being created in the universe today.
(C) If no new radioactive elements had been created after the universe began, almost no radioactive elements would be left in the universe today.
(D) It is possible that radioactive elements were created when the universe began.
(E) Due to their instability, most of the universe's radioactive elements decay within at most a few million years into other, nonradioactive elements.
28 Jul 2026, 12:02
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Radioactive elements may have been created when the universe began. However, even if this occurred, these elements are clearly still being created in the universe today. Radioactive elements are unstable, so most of them decay within at most a few million years into other, nonradioactive elements. So, if no new radioactive elements had been created after the universe began, almost no radioactive elements would be left in the universe today, but there is an abundance of such elements.
Which one of the following most accurately expresses the main conclusion of the argument?
The correct answer to this Main Conclusion question will be the choice that states the final conclusion of the argument
The final conclusion will be a claim supported by other statements in the passage that also does not support any other statement in the passage.
Analyzing the passage by considering the logic of how the sentences work together, we can see that the argument works as follows:
First some background information is provided:
Radioactive elements may have been created when the universe began.
Then, a claim is stated:
However, even if this occurred, these elements are clearly still being created in the universe today.
Then, information supporting that claim is provided:
Radioactive elements are unstable, so most of them decay within at most a few million years into other, nonradioactive elements.
A intermediate conclusion serving as a bridge between the information and the claim is stated:
So, if no new radioactive elements had been created after the universe began, almost no radioactive elements would be left in the universe today,
Finally, another piece of information that provides support for the claim is provided:
but there is an abundance of such elements.
So, the flow of the reasoning is that the last two sentences combine to support the claim stated by the second sentence.
Set up with this understanding, we can go to the answer choices.
(A) Any radioactive elements created when the universe began have probably decayed into other, nonradioactive elements.
This states a conclusion that follows from things said by the passage, but it is not the main conclusion of the argument, which, as our analysis indicates, is "even if this occurred, these elements are clearly still being created in the universe today."
Eliminate.
(B) Radioactive elements are being created in the universe today.
This is a restatement of the final conclusion of the passage stated by the second sentence, "even if this occurred, these elements are clearly still being created in the universe today."
We can tell that the claim stated by the second sentence is the final conclusion because it is supported by the third and fourth sentences and does not support anything else.
Keep.
(C) If no new radioactive elements had been created after the universe began, almost no radioactive elements would be left in the universe today.
This is a restatement of the first part of the fourth sentence of the passage.
That part of the fourth sentence states a conclusion supported by the third sentence. At the same time, it also supports the conclusion stated by the second sentence, "even if this occurred, these elements are clearly still being created in the universe today."
So, this is an intermediate conclusion, rather than the main conclusion.
Eliminate.
(D) It is possible that radioactive elements were created when the universe began.
This is a restatement of the first sentence of the passage, which is background information not supported by any other statement.
Eliminate.
(E) Due to their instability, most of the universe's radioactive elements decay within at most a few million years into other, nonradioactive elements.
This is stated as fact by the third sentence of the passage and is not supported by other statements.
Also, this is part of the support for the conclusion stated by the second sentence, "even if this occurred, these elements are clearly still being created in the universe today."
So, this is factual supporting information rather than the main conclusion.
Eliminate.
Correct answer: B
Which one of the following most accurately expresses the main conclusion of the argument?
The correct answer to this Main Conclusion question will be the choice that states the final conclusion of the argument
The final conclusion will be a claim supported by other statements in the passage that also does not support any other statement in the passage.
Analyzing the passage by considering the logic of how the sentences work together, we can see that the argument works as follows:
First some background information is provided:
Radioactive elements may have been created when the universe began.
Then, a claim is stated:
However, even if this occurred, these elements are clearly still being created in the universe today.
Then, information supporting that claim is provided:
Radioactive elements are unstable, so most of them decay within at most a few million years into other, nonradioactive elements.
A intermediate conclusion serving as a bridge between the information and the claim is stated:
So, if no new radioactive elements had been created after the universe began, almost no radioactive elements would be left in the universe today,
Finally, another piece of information that provides support for the claim is provided:
but there is an abundance of such elements.
So, the flow of the reasoning is that the last two sentences combine to support the claim stated by the second sentence.
Set up with this understanding, we can go to the answer choices.
(A) Any radioactive elements created when the universe began have probably decayed into other, nonradioactive elements.
This states a conclusion that follows from things said by the passage, but it is not the main conclusion of the argument, which, as our analysis indicates, is "even if this occurred, these elements are clearly still being created in the universe today."
Eliminate.
(B) Radioactive elements are being created in the universe today.
This is a restatement of the final conclusion of the passage stated by the second sentence, "even if this occurred, these elements are clearly still being created in the universe today."
We can tell that the claim stated by the second sentence is the final conclusion because it is supported by the third and fourth sentences and does not support anything else.
Keep.
(C) If no new radioactive elements had been created after the universe began, almost no radioactive elements would be left in the universe today.
This is a restatement of the first part of the fourth sentence of the passage.
That part of the fourth sentence states a conclusion supported by the third sentence. At the same time, it also supports the conclusion stated by the second sentence, "even if this occurred, these elements are clearly still being created in the universe today."
So, this is an intermediate conclusion, rather than the main conclusion.
Eliminate.
(D) It is possible that radioactive elements were created when the universe began.
This is a restatement of the first sentence of the passage, which is background information not supported by any other statement.
Eliminate.
(E) Due to their instability, most of the universe's radioactive elements decay within at most a few million years into other, nonradioactive elements.
This is stated as fact by the third sentence of the passage and is not supported by other statements.
Also, this is part of the support for the conclusion stated by the second sentence, "even if this occurred, these elements are clearly still being created in the universe today."
So, this is factual supporting information rather than the main conclusion.
Eliminate.
Correct answer: B
28 Jul 2026, 16:45
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Radioactive elements may have been created when the universe began. However, even if this occurred, these elements are clearly still being created in the universe today. Radioactive elements are unstable, so most of them decay within at most a few million years into other, nonradioactive elements. So, if no new radioactive elements had been created after the universe began, almost no radioactive elements would be left in the universe today, but there is an abundance of such elements.
Which one of the following most accurately expresses the main conclusion of the argument?
The argument allows that radioactive elements may have been created at the beginning of the universe. But its main point is that radioactive elements must also be created today, because otherwise most would have decayed long ago. The main conclusion is the claim that radioactive elements are still being created now.
(A) Any radioactive elements created when the universe began have probably decayed into other, nonradioactive elements.
This is not the main conclusion. It follows from the idea that radioactive elements decay quickly, but it is used to support the broader claim.
(B) Radioactive elements are being created in the universe today.
This is correct. This is the main claim the argument is trying to prove.
(C) If no new radioactive elements had been created after the universe began, almost no radioactive elements would be left in the universe today.
This is not the main conclusion. It is a supporting conditional statement used to prove that new radioactive elements must still be created.
(D) It is possible that radioactive elements were created when the universe began.
This is not the main conclusion. It is a concession at the start of the argument.
(E) Due to their instability, most of the universe's radioactive elements decay within at most a few million years into other, nonradioactive elements.
This is a premise. It explains why old radioactive elements would mostly be gone by now.
Answer: (B)
Which one of the following most accurately expresses the main conclusion of the argument?
The argument allows that radioactive elements may have been created at the beginning of the universe. But its main point is that radioactive elements must also be created today, because otherwise most would have decayed long ago. The main conclusion is the claim that radioactive elements are still being created now.
(A) Any radioactive elements created when the universe began have probably decayed into other, nonradioactive elements.
This is not the main conclusion. It follows from the idea that radioactive elements decay quickly, but it is used to support the broader claim.
(B) Radioactive elements are being created in the universe today.
This is correct. This is the main claim the argument is trying to prove.
(C) If no new radioactive elements had been created after the universe began, almost no radioactive elements would be left in the universe today.
This is not the main conclusion. It is a supporting conditional statement used to prove that new radioactive elements must still be created.
(D) It is possible that radioactive elements were created when the universe began.
This is not the main conclusion. It is a concession at the start of the argument.
(E) Due to their instability, most of the universe's radioactive elements decay within at most a few million years into other, nonradioactive elements.
This is a premise. It explains why old radioactive elements would mostly be gone by now.
Answer: (B)
