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【单选题】
用描述法表示下列各集合: 在直角坐标系中,由第一象限所有的点组成的集合A.
｛ 在直角坐标系中，第一象限所有的点组成的集合 ｝
B.
｛ 在直角坐标系中，第一象限的点 ｝
C.
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A.
is liable to
B.
is critical to
C.
is attributable to
D.
is inclined to
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