At Age 21, You Set Out for a Star That $0.96 c$

Multiple Choice

At age 21, you set out for a star that is 50 light-years from Earth. How fast would your spaceship have to travel in order to reach that star when you are 61 years old? One light-year is the distance light travels in one year.

A) $0.96 c$
B) $0.88 c$
C) $0.58 \mathrm { c }$
D) $0.78 \mathrm { c }$
E) $0.68 c$