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题目材料：

It can be inferred from the sentence highlighted in the passage that a standard candle is useful to scientists for which of the following reasons?

A.Standard candles do not have their own locus of motion.
B.Standard candles more reliably adhere to the law of inverse squares than do other supernovas.
C.Only standard candles provide a known measure of brightness.
D.Knowledge of an object's brightness of an object allows scientists to measure the speed at which the object is moving toward Earth.
E.Knowledge of an object's brightness allows scientists to accurately measure its distance from Earth.

E显示答案

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以上解析由考满分老师提供。