Answer:
Since the amount of helium is directly proportional to the age of a sequence star
Step-by-step explanation:
For this particular question, we need to understand how main sequence stars work. The main sequence stars are fusing hydrogen atoms into helium atoms. That said, overtime the amount of hydrogen atoms decreases and the amount of helium atoms increases.
Consequently, the older the star, the greater the fraction (or the percentage) of helium in it. That said, an older main sequence star would have a greater percentage of helium than a younger main sequence star.