Choose the best answer to the following.

Solution 10QQ:

Step 1 of 2:-

Here, we have to find which of the given star is more massive..

The most massive star among the given stars is, a)  main sequence A star.

According to Harvard spectral classification, the letters O, B, A, F, G, K, M indicate the type of stars.

The letters are in a descending order of mass the types of stars have, which means that O type star has the highest mass and the M type has the lowest mass.