Question

The list of animals that exhibits a preference of either using the right or the left hand (i.e. claw, paw, or foot) has been expanded to include the lower vertebrates.

• A. exhibits a preference of either using the right or the left hand (i.e. claw, paw, or foot) has been expanded to include
• B. exhibits the preference to use either the right or the left hand (i.e. claw, paw, or foot) has been expanded and includes
• C. exhibit a preference in either using the right or the left hand (i.e. claw, paw, or foot) has been expanded to include
• D. exhibit a preference for using either the right or the left hand (i.e. claw, paw, or foot) has been expanded to include

Answer 1

The correct option is D exhibit a preference for using either the right or the left hand (i.e. claw, paw, or foot) has been expanded to include

In (A) "...list of animals that exhibits": the animals exhibit, not exhibits. Plus, the parallelism is wrong here, too: "either using... or the left hand." Eliminate (A).
In (B) The parallelism is better, but the subject-verb agreement is still wrong. Eliminate (B).
In (C) Same parallelism error as in (A). (C) is gone, too.
In (D) Subject-verb is correct, and so does the parallelism. (D).Hence the answer.