A first magnitude star is（）.<br>A:2.5 times as bright as a second magnitude star<br>B:3 times as bright as a second magnitude star<br>C:5 times as bright as a second magnitude star<br>D:10 times as bright as a second magnitude star

A first magnitude star is（）.
A:2.5 times as bright as a second magnitude star
B:3 times as bright as a second magnitude star
C:5 times as bright as a second magnitude star
D:10 times as bright as a second magnitude star

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