We Can Learn a Lot About the Properties of a Star

We can learn a lot about the properties of a star by studying its spectrum.All of the following statements are true except one.Which one?

A) The peak of the star's thermal emission tells us its temperature: Hotter stars peak at shorter (bluer) wavelengths.
B) The total amount of light in the spectrum tells us the star's radius.
C) We can identify chemical elements present in the star by recognizing patterns of spectral lines that correspond to particular chemicals.
D) We can look at Doppler shifts of spectral lines to determine the star's speed toward or away from us.