Explanation:

Stars spend most of their lives in the main sequence phase, where they fuse hydrogen into helium in their cores. The more massive the star, the shorter its main sequence lifetime. O-type stars are the most massive and luminous stars, and therefore have the shortest main sequence lifetimes, typically only a few million years.

After leaving the main sequence, massive stars evolve rapidly through subsequent stages, including the red giant phase and the supergiant phase, before ending their lives in a supernova explosion.