【单选题】

According to the passage, in theCepheid variable method all of the following have a significant role in the calculation of the distance of a galaxyEXCEPT

A、The intrinsic luminosity of aCepheid
B、The comparative luminosity of ordinary stars
C、The observed brightness of theCepheid
D、The data suggesting the expansion of the universe
E、The correction of the period-luminosity relation for the star being observed