Here's the
official explanation provided by the GMAC for this question:
The sentence makes a comparison using
than, which requires parallelism in the two terms of the comparison. In this case, what are compared are the likelihoods of two different investment choices: investors uncertain about the future are
more likely to put money into … bills than [to put money] into gold.Option A: Correct. The comparison is correctly expressed using
than. The parallelism consists of a structure
more likely to do X than [to do] Y. In this case, the phrase
to put money is correctly omitted in the second term of the comparison for the sake of economy of expression. Such an omission is idiomatically standard in this type of construction and thus is not ungrammatical.
Option B: Although
than is the correct word for making the comparison, the parallelism with
to put money into blue-chip stocks or treasury bills is absent in the incoherent wording
they do gold. Although both
they and
the investor are undoubtedly intended to refer generally to investors who are uncertain about the future, the plural pronoun
they creates some tension with the singular noun phrase
the investor. With the use of
they, the phrasing I
nvestors who are would have been preferable to
The investor who is.
Option C: The parallelism required with
to put money into blue-chip stocks or treasury bills is absent in the incoherent wording
they are gold. The sentence provides no information about what the pronoun
they is meant to refer to.
Option D: As explained,
than is required in making a comparison using
more;
as is incorrect.
Option E: As explained,
than is required in making a comparison using
more;
as is incorrect. It is structurally unclear whether gold is being compared to
the investor, to
money, or to
blue-chip stocks or treasury bills.
The correct answer is A.
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.