Here's the
official explanation provided by the GMAC for this question:
All but one of the versions of this sentence use the phrase
the greater chance. In standard usage,
the greater contrasts one quantity with one other, not with multiple others. Unless the risk referred to in this sentence is being compared to the risk incurred by someone in an unseen previous context,
the greater is the wrong expression, because the contrast is between the level of risk incurred by one type of person and the levels of risk incurred by two other types of people.
Option A: The chance ...
belongs not to ...
nor is awkward and unidiomatic.
Not is followed by a prepositional phrase starting with
to, which is not parallel to the noun phrases following
nor and
but.
The greater is the wrong expression; since three levels of risk are being compared, the appropriate expression would be
the greatest.
Option B: The greater chance ...
is not risked by is illogically redundant.
The greater is the wrong expression; since three levels of risk are being compared, the appropriate expression would be
the greatest.
Option C: Correct. This version uses the words correctly and is structured using concise parallel constructions that clearly express the relationships among the levels of risk and among those incurring the risks.
Option D: Who risks the greater chance is illogically redundant.
The greater is the wrong expression; since three levels of risk are being compared, the appropriate expression would be
the greatest.
Option E: Most risking the greater chance is illogically redundant. In the phrase
male nor female, the conjunction should be
or instead of
nor.
The greater is the wrong expression; since three levels of risk are being compared, the appropriate expression would be
the greatest.
The correct answer is C.
Please note that I'm not the author of this explanation. I'm just posting it here since I believe it can help the community.