A group of graduate students, bored during a cloudy night at the observatory, begin to make bets about the time different stars will take to evolve. If they have a cluster of stars which were all born at roughly the same time, and want to know which star will become a red giant first, which of the following stars should they bet on:. a) a star of about 8% the mass of our Sun
b) a star that would type on the main sequence star
c) a star of about the same mass as our Sun
d) you can't fool me, all stars reach the red giant stage in roughly the same number of years
e) a star of about 1/2 the mass of our Sun