A Star Looks Predominantly Yellow to an Observer Who Is

Multiple Choice

A star looks predominantly yellow to an observer who is at rest with respect to the star. To an observer moving away from the star at 1% of the speed of light, the star will look predominantly

A) red.
B) blue.
C) yellow, but each part of the spectrum will be shifted to slightly shorter wavelengths.
D) yellow, but each part of the spectrum will be shifted to slightly longer wavelengths.