The Spiral Galaxy of Which Earth Is a Part Is

The spiral galaxy of which Earth is a part is roughly 14 billion years old. Which of these statements about the stars that formed when the Milky Way Galaxy was very young (say, during the first billion years) is true?

A) No stars are still on the main sequence-in this time all stars have finished their lives.
B) All stars of less than 3/4 of the mass of the Sun are still on the main sequence.
C) All stars of more than 15 times the mass of the Sun are still on the main sequence.
D) All stars of 3 times the mass of the Sun are still on the main sequence.