Correct Answer: E
Explanation:
DO
(brother of) → REY
(sister of) → MI
(brother of) → FA
Neither I nor II must be false. We do know that Rey is the sister of Mi, and Mi is the brother of Fa, so we therefore know that Rey and Fa are related. But since we do not know whether Fa is a boy or a firl, I )”Fa is Rey’s”) could possibly be true. Statement II (“Do is Mi’s brother”), on the other hand, is definitely true, since Do is the brother of Rey, and Rey is the sister of Mi. (Be careful of the wording in these types of questions. Look for the words “MUST be true” and “could be true,” two very different situations.)