Astronaut Rachel Leaves Earth in a Spaceship at a Speed $0.960 c$

Multiple Choice

Astronaut Rachel leaves Earth in a spaceship at a speed of $0.960 c$ relative to an observer on Earth. Rachel's destination is a star system $14.4$ light-years away (one light-year is the distance light travels in one year) . According to Rachel, how long does the trip take?

A) 11 years
B) 23 years
C) $4.2$ years
D) 15 years
E) 14 years