What Is the Lifetime of a 10-Solar-Mass Star on the Main

Multiple Choice

What is the lifetime of a 10-solar-mass star on the main sequence

A) $3.2 × 10^7$ years
B) 320 years
C) $3.2 × 10^{12}$ years
D) $1× 10^9$ years
E) $1 × 10^{11}$ years