Astronaut Rob Leaves Earth in a Spaceship at a Speed

Multiple Choice

Astronaut Rob leaves Earth in a spaceship at a speed of 0.960c relative to an observer on Earth.Rob's destination is a star system 14.4 light-years away (one light-year is the distance light travels in one year) .Relative to a frame of reference that is fixed with respect to Earth,how long does it take Rob to complete the trip?

A) 14.4 years
B) 15.0 years
C) 10.8 years
D) 4.20 years
E) 22.7 years