PLEASE HELP :) What percentage of US solders were injured or killed in the Vietnam War?

A: 50%
B: 25%
C: 5%
D: 10%

Which revelation resulted from the observation of the spectrum of different galaxies? a. there were more galaxies whose spectrum was blueshifted b. there were no galaxies whose spectrum was redshifted c. there were more galaxies whose spectrum was redshifted d. there were no galaxies whose spectrum was blueshifted