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Mathが得意なつもりでしたが、Official Guideの答えとあいません。以下の問題、どなたか分かる方教えて下さ〜い。
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64. Today Rose is twice as old as Sam and Sam is 3 years younger than Tina. If Ros, Sam and Tina are all alive 4 years from today, which of the following must be true on that day?
I. Rose is twice as old as Sam.
II. Sam is 3 years younger than Tina.
III. Rose is older than Tina.
(A) I only
(B) II only
(C) III only
(D) I and II
(E) II and III
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回答は（Ｂ）なのですが、その解説も含め納得できません。
IIIも成立すると思うのですが。。
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