Explanation
Legislator: Relatively few people in this society object to allowing the potential use of gene replacement techniques to treat disease, but most react negatively to allowing the use of such techniques to enhance people's performance in competitive sports. A clear distinction should therefore be made between medical treatment and performance enhancement when regulations concerning gene replacement are being formulated, because otherwise __________
Which of the following most logically completes the passage?
This question is interesting since "because" is typically followed by a statement that supports what precedes "because" while, in this case, what follows "because" at the end of the passage not only supports what precedes "because" but also is supported by what's said earlier in the passage.
So, the correct answer to this question isn't a simple premise. Rather it's an intermediate conclusion that supports the final conclusion.
In other words, "otherwise __________" follows from something said earlier in the passage and then supports "A clear distinction should therefore be made between medical treatment and performance enhancement when regulations concerning gene replacement are being formulated."
To more clearly see how the elements of the passage work together, we can rewrite the passage to express the same meaning in the following way:
Premise: Relatively few people in this society object to allowing the potential use of gene replacement techniques to treat disease, but most react negatively to allowing the use of such techniques to enhance people's performance in competitive sports.
Intermediate conclusion: Thus, if a clear distinction is not made between medical treatment and performance enhancement when regulations concerning gene replacement are being formulated., then __________. (This is a translation of "otherwise __________.")
Final conclusion: A clear distinction should therefore be made between medical treatment and performance enhancement when regulations concerning gene replacement are being formulated.
A these regulations will not accurately reflect the sentiments of most people in this society
Notice that, with this choice in the blank, the intermediate conclusion is perfectly completed and the passage makes sense:
Relatively few people in this society object to allowing the potential use of gene replacement techniques to treat disease, but most react negatively to allowing the use of such techniques to enhance people's performance in competitive sports.
Thus, if a clear distinction is not made between medical treatment and performance enhancement when regulations concerning gene replacement are being formulated., then these regulations will not accurately reflect the sentiments of most people in this society.
A clear distinction should therefore be made between medical treatment and performance enhancement when regulations concerning gene replacement are being formulated.
After all, the intermediate conclusion "if a clear distinction is not made between medical treatment and performance enhancement when regulations concerning gene replacement are being formulated., then these regulations will not accurately reflect the sentiments of most people in this society," follows logically from "Relatively few people in this society object to allowing the potential use of gene replacement techniques to treat disease, but most react negatively to allowing the use of such techniques to enhance people's performance in competitive sports."
So, this choice logically completes the passage.
Keep
B gene replacement may be used for purposes yet unimagined
This choice doesn't make sense in the context of "A clear distinction should therefore be made between medical treatment and performance enhancement when regulations concerning gene replacement are being formulated, because otherwise __________," because "A clear distinction ... between medical treatment and performance enhancement when regulations concerning gene replacement are being formulated," would not prevent gene replacement from being used for purposed yet unimagined.
After all, regardless of whether that distinction is made, gene replacement could be used for purposes yet unimagined.
Eliminate.
C the opinions people have of gene replacement will not have a scientific basis
This choice doesn't make sense in the context of "A clear distinction should therefore be made between medical treatment and performance enhancement when regulations concerning gene replacement are being formulated, because otherwise __________," because "A clear distinction ... between medical treatment and performance enhancement when regulations concerning gene replacement are being formulated," would not cause people to have a scientific basis for their opinions.
Eliminate.
D the generally accepted conception of athletic ability will have already shifted by the time the regulations are implemented
This choice doesn't make sense in the context of "A clear distinction should therefore be made between medical treatment and performance enhancement when regulations concerning gene replacement are being formulated, because otherwise __________," because "A clear distinction ... between medical treatment and performance enhancement when regulations concerning gene replacement are being formulated," would not prevent the generally accepted conception of athletic ability from shifting by the time the regulations are implemented.
Eliminate.
E the potential benefits of gene replacement will never be fully realized
This choice doesn't make sense in the context of "A clear distinction should therefore be made between medical treatment and performance enhancement when regulations concerning gene replacement are being formulated, because otherwise __________," because "A clear distinction ... between medical treatment and performance enhancement when regulations concerning gene replacement are being formulated," would not cause the potential benefits of gene replacement to be fully realized.
Eliminate.
The correct answer is (A).