Which word group contains a subject and a verb in agreement?

everyone are

they talks

contestants are running

krumpers prepares

(a) "Everyone are" is wrong. "Everyone" is an indefinite pronoun and stands as singular. Therefore, we should say "everyone is" instead.

(b) "They talks" is wrong. "They" is pronoun referring to many people. Therefore, we should use the appropriate verb and say "they talk" instead.

(c) "Contestants are running" is correct. "Contestants" is a plural noun and needs a plural verb. "Are" is in the plural form of a verb.

(d) "Krumpers prepares" is wrong. "Krumpers" is a plural noun and needs a plural verb. Therefore, we should say "krumpers prepare" instead.