The correct option is B) far lower than that of a human’s body
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 that of a human’s body.
Adverbial comparison clauses of style Adverb clauses of degree comparison are prefaced with either the relative adverb as or the subordinating conjunction than. The verb of the adverb clause of degree comparison is typically not expressed.
Here, merely mentioning "humans" is insufficient because it is not apparent which aspect we are referring to. When we say "human body," it is best to say "that of a" rather than just "human body." Only B fixes these mistakes without introducing new ones.
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