刚开始复习GMAT数学OG第7题就看不明白！答案也不是很明白~非常upset希望各位高手帮忙~

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7. If u>t, r > q, s > t, and t > r, which of
the following must be true?
Ⅰ. u>s
Ⅱ. s>q
Ⅲ. u>r
(A)Ⅰonly

(B)Ⅱonly
(C)Ⅲ only
(D)Ⅰand Ⅱ
(E) Ⅱand Ⅲ
Explanation:
From the given inequalities, we can
conclude that q < r < t < u, and it is
helpful to know s > u or t < s < u. Thus,
II and III must be true, but I may be
untrue. So, E is the correct answer.