单选题:某校食堂今日供应茄子、鸡丁、辣椒三种菜色,规定每人最多只能选择两种不同的菜。请问,至少在几位同学中才一定有两个人选择了相

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题目内容:
某校食堂今日供应茄子、鸡丁、辣椒三种菜色,规定每人最多只能选择两种不同的菜。请问,至少在几位同学中才一定有两个人选择了相同的菜色?(  ) A.4
B.5
C.6
D.7
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