Use the Following Scenario for the Next Question

Use the following scenario for the next question.
A 26-year-old biologist makes a trip to study alien life forms in a distant planet 10 light-years away. The round trip including a stay of 1 year in the distance planet takes 21.5 years according to the clock on earth. The biologist's son is 3-year-old when he left. Assume that the planet is not moving with respect to Earth, and the speed is the same for both outbound and inbound part of the journey.
-What is the total distance traveled according to the biologist? Give your answer in
Light-years.

A) 1.69
B) 4.39
C) 6.78
D) 7.45
E) 9.45

Correct Answer:

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