The correct answer is:

c) ACTOR: CAST

Explanation:

In the given pair "SINGER: CHORUS," a singer is associated with a chorus, which is a group of singers. Similarly, in option (c) "ACTOR: CAST," an actor is associated with a cast, which is a group of actors.

Explanation for why the other options are not correct:

a) ARCHITECT: BLUEPRINT - An architect creates blueprints, but the relationship is not about a person and a group.

b) AUTHOR: PUBLISHER - An author writes books, and a publisher may publish them, but it doesn't represent a person and a group.

d) TEACHER: STUDENT - A teacher teaches students, but the relationship is not about a person and a group.