sat blue book grammar question?

marvin100
Tue, 07 Jul 2015 00:42:50 +0000

(B) is wrong because the pronoun “its” is singular and the antecedent “walruses” is plural.
(E) is a tense error–you have the superpast “had” construction in the second part of the sentence, so the previous event must be simple past (“were”). It has other problems, but this one is the most glaring.