Answer:
A) 15.0 years
Explanation:
Due to the distance to the star system is in light-year units, we can compute the time by using:
[tex]t=\frac{d}{v}=\frac{14.4 l-y}{0.960}=15l-y[/tex]
then, Rob will take to complete the trip about 15 light-years.
hope this helps!!