An Astronaut Leaves Earth in a Spaceship at a Speed

Multiple Choice

An astronaut leaves Earth in a spaceship at a speed of 0.96 c relative to an observer on Earth. The astronaut's destination is a star system 14.4 light-years away (one light-year is the distance light travels in one year.) According to the astronaut, how long does the trip take?

A) 14.4 years
B) 22.7 years
C) 9.34 years
D) 15.0 years
E) 4.20 years