How do we call the duration of time required for the Solar System to orbit once around the center of the Milky Way galaxy?

Question: How do we call the duration of time required for the Solar System to orbit once around the center of the Milky Way galaxy?

Options:

Light year
Cosmic year
Solar year
None of these

Correct answer:

Cosmic year

Other game answers:
Find the answers to guess the gif, logo quiz 2015, emoji puzzle and emoji nation.
You can find other questions and answers of trivia crack at triviacrackcheats.org (other languages are also available, for this game).