Basic Writing Question

<p>Hi there!
Could someone please explain this question to me. I think it is really weird. It appears on the official CB website:</p>

<p>One reason that an insect can walk on walls while a human cannot is that the mass of its tiny body is (far lower than humans).</p>

<p>(A) far lower than humans
(B) far lower than that of a human's body
(C) lower by far than humans
(D) far lower than a human
(E) far lower than is a human's body</p>

<p>I know that this question is dealing with inappropriate comparisons.
I would say that (B) is correct, but obviously (D) is supposed to be correct.
I cannot understand that.</p>

<p>In (D), "the mass of the insect's body" is compared to "a human". That sounds really awkward to me! Why is it correct though?
And why is (B) not correct since here "the mass of its tiny body" is compared with "that of a human's body"!</p>

<p>Thanks in advance for your help!</p>

<p>The answer given was a mistake (a typo). The answer is B, and your reasoning is correct.</p>

<p>I am relieved! Thank you very much! :)</p>