N={小于1050的正整数}，
P={定圆C的内接三角形}，
Q={所有能被7整除的数}，
其中无限集是（ ）
A：M、N、P
B：M、P、Q
C：N、P、Q
D：M、N、Q
根据短文理解，选择正确答案。
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