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Which of the following is/are an example of pigeon hole principle?

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Which of the following is/are an example of pigeon hole principle?

(a) Softball team

(b) Sock picking

(c) Hair counting

(d) All of the mentioned

I had been asked this question in unit test.

I'm obligated to ask this question of Applications of Pumping Lemma/Pigeonhole principle in chapter Properties of Regular Languages of Automata Theory

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The correct answer is (d) All of the mentioned

Best explanation: There are several applications of pigeonhole principle:

Example: The softball team: Suppose 7 people who want to play softball(n=7 items), with a limitation of only 4 softball teams to choose from. The pigeonhole principle tells us that they cannot all play for different teams; there must be atleast one team featuring atleast two of the seven players.

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