题目内容

According to the passage, in the Cepheid variable method all of the following have a significant role in the calculation of the distance of a galaxy EXCEPT

A. (A) The intrinsic luminosity of a Cepheid
B. (B) The comparative luminosity of ordinary stars
C. (C) The observed brightness of the Cepheid
D. (D) The data suggesting the expansion of the universe
E. (E) The correction of the period-luminosity relation for the star being observed

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