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MVA
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Poor editing of the question. However the answer has to be A. The last sentence explicitly quotes this.
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MVA
Consider three fish swimming together in a school. The space within which each fish can be seen by predator Y is defined by a sphere centered on the fish and having a radius that is the maximum distance Y can see. The school is vulnerable to attack when Y is within one of the three spheres. The spheres overlap to a great extent, since the fish are in a compact group.

Which of the following is a reliable inference to be drawn from the passage above?


(A) The vulnerability to attack of the school as a whole is not much greater than the vulnerability to attack of any one fish in the school.

(B) There is less chance that predator Y will attack a school of four fish than that it will attack a school of three fish.

(C) Fish who swim I schools are less likely to be devoured by predators than are fish who do not swim in schools.

(D) The maximum distance at which an individual fish is visible depends less on the size of the fish than on whether the fish is swimming in a school.

(E) The maximum distance at which predator Y can see its prey is increased if Y is itself swimming in a school of Y’s.

Given: Consider three fish swimming together in a school. The space within which each fish can be seen by predator Y is defined by a sphere centered on the fish and having a radius that is the maximum distance Y can see. The school is vulnerable to attack when Y is within one of the three spheres. The spheres overlap to a great extent, since the fish are in a compact group.

Asked: Which of the following is a reliable inference to be drawn from the passage above?

Since Y >> distance between fishes ; Since the fish are in a compact group and the spheres overlap to a great extent
Vulnerability of a single fish ~ Vulnerability of the group of fish ~ Vulnerability of the school

(A) The vulnerability to attack of the school as a whole is not much greater than the vulnerability to attack of any one fish in the school.

(B) There is less chance that predator Y will attack a school of four fish than that it will attack a school of three fish.
Out of scope
(C) Fish who swim I schools are less likely to be devoured by predators than are fish who do not swim in schools.
Out of scope
(D) The maximum distance at which an individual fish is visible depends less on the size of the fish than on whether the fish is swimming in a school.
Irrelevant
(E) The maximum distance at which predator Y can see its prey is increased if Y is itself swimming in a school of Y’s.
Out of context

IMO A
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Evo23
Not a Official GMAT type question. What is the source?

This question comes from a bundle of CR questions gathered together by a prep school, but I didn't mean to provide the forum with an unreliable question.

If anybody else agrees with you, I will delete this post.

Apologies

It is good question. I don't think it should be deleted.

Quote:
Consider three fish swimming together in a school. The space within which each fish can be seen by predator Y is defined by a sphere centered on the fish and having a radius that is the maximum distance Y can see. The school is vulnerable to attack when Y is within one of the three spheres. The spheres overlap to a great extent, since the fish are in a compact group.

Few important terms in above statement : SCHOOL, SPACE, RADIUS, SPHERES, OVERLAP.

QUESTION: Identify Reliable Inference.

Let's find out which option is reliable Inference.

Quote:
(A) The vulnerability to attack of the school as a whole is not much greater than the vulnerability to attack of any one fish in the school.

Last statement of paragraph says "The spheres overlap to a great extent, since the fish are in a compact group". It means probability to attach one fish and school of fish is almost same.

This option looks good. Please keep it.

Quote:
(B) There is less chance that predator Y will attack a school of four fish than that it will attack a school of three fish.

paragraph is mostly about SCHOOL of Fish and Single single. We are not worried about if School is of 3 fish or 4 fish.

Quote:
(C) Fish who swim I schools are less likely to be devoured by predators than are fish who do not swim in schools.
Paragraph doesn't say anything about fish which doesn't swim in school.

Quote:
(D) The maximum distance at which an individual fish is visible depends less on the size of the fish than on whether the fish is swimming in a school.
We do not know anything what is the impact of size of fish on whole conversation.

Quote:
(E) The maximum distance at which predator Y can see its prey is increased if Y is itself swimming in a school of Y’s.

Again, nothing is mentioned what will happen when Y swims in school.

A is answer.
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I agree. Even though this is not an official question, its a good one and its certainly not unlike a GMAT type question and I don't think it should be deleted.

"The school is vulnerable to attack when Y is within one of the three spheres."

This statement directly supports option A

Others are clearly out of scope. D might be close but there is not enough evidence to support it

Answer is A

Posted from my mobile device
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Evo23
Not a Official GMAT type question. What is the source?

This question comes from a bundle of CR questions gathered together by a prep school, but I didn't mean to provide the forum with an unreliable question.

If anybody else agrees with you, I will delete this post.

Apologies

I think it's a good question and you should keep it :) . The incorrect options can be clearly justified using the information in the passage and same can be done for the correct option.
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MVA
Consider three fish swimming together in a school. The space within which each fish can be seen by predator Y is defined by a sphere centered on the fish and having a radius that is the maximum distance Y can see. The school is vulnerable to attack when Y is within one of the three spheres. The spheres overlap to a great extent, since the fish are in a compact group.

Which of the following is a reliable inference to be drawn from the passage above?


(A) The vulnerability to attack of the school as a whole is not much greater than the vulnerability to attack of any one fish in the school.

(B) There is less chance that predator Y will attack a school of four fish than that it will attack a school of three fish.

(C) Fish who swim I schools are less likely to be devoured by predators than are fish who do not swim in schools.

(D) The maximum distance at which an individual fish is visible depends less on the size of the fish than on whether the fish is swimming in a school.

(E) The maximum distance at which predator Y can see its prey is increased if Y is itself swimming in a school of Y’s.

Althoough i got this answer correct but can anyone please explain "The school is vulnerable to attack when Y is within one of the three spheres" the role of this line as i am unable to understand this three sphere things.

thanks in advance
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