Which of the following sentences is capitalized correctly?

A.

Markus rode in a black hawk helicopter on his birthday.

B.

Effy will enroll in Camazotz junior college next semester.

C.

Kejara plans to interview mayor Castlebridge in October.

D.

Lyisa studied artists of the twentieth century in art class.

Lyisa studied artists of the twentieth century in art class.

Explanation:

Periods of history and major events are capitalized, but century numbers, such as "twentieth century," should not be capitalized. The name of a course is only capitalized when it refers to a specific and complete course title. In this sentence, "art class" should not be capitalized because it does not refer to a specific course.