Which simple sentence has a compound subject? A. The summer break begins on June 6. B. Anton, Chris, and Jacob plan to volunteer this summer. C. They hope to volunteer at the zoo, the museum, or the state park. D. Two volunteer positions are available at the museum.
Compound subjects exists when two or more noun come together to describe a single entity, therefore "A. The summer break begins on June 6" is correct, because of "summer break" being a single entity made up of two separate nouns.