题目内容：
根据下列材料，请回答题：
What does Maggie Scarf point out in her new book?（ ）
[A] People who get married in their 50s are happy.
[B] Couples who got married long ago are happy.
[C] Men in their 60s are full of unexpected pleasures.
[D] People should turn attention to couples in their 50s.
参考答案：
答案解析：