Pepper, the Space Cat, Travels to the Centauri Star System

Multiple Choice

Pepper, the space cat, travels to the Centauri star system 4.5 light-years away (one light-year is the distance light travels in one year) at a speed of 0.90 c. Relative to the Earth's frame of reference, the time it takes Pepper to reach the star system is

A) 5.0 years.
B) 4.5 years.
C) 10. years.
D) 4.0 years.