13.

Answer and Explanation

Your Answer is

Correct Answer is A

Explanation

Item A: In 2006 is the adverbial of time in the following sentence, which is placed at the beginning of the sentence as a parenthesis, so it is separated by double commas, and item A is correct.

B/D item: and two sentences in parallel, need a comma before, B/D is wrong.

Item C: Because in 2006 is a whole, it cannot be separated by commas, so item C is wrong.