Which sentence correctly references page 99 of this source according to MLA guidelines? Asher, Vincent. Stepping Stones of Summer. New York:

Harper Sisters Books, 2016. Print.

A. The push to adopt a European system of summer vacation has gained popularity (Asher 99).

B. The push to adopt a European system of summer vacation has gained popularity (Asher, p. 99).

C. The push to adopt a European system of summer vacation has gained popularity (Asher 99)

D. The push to adopt a European system of summer vacation has gained popularity. (Asher, 99)