Which word group contains a subject and a verb in agreement?
everyone are
they talks
contestants are running
krumpers prepares user: which agreement rule applies to a subject joined by or or nor?
use a plural verb
use a singular verb
make the verb agree with the subject closest to the verb
make the verb agree with the first subject listed

The word group that contains a subject and verb in agreement with each other is "contestants are running". 
A word group is a group of words where there is a grammatical relationship between the words. In our example: "contestants are running", the subject is "contestants" and the verb is "are running". 
The agreement rule that applies to a subject joined by or nor is: use a singular verb. A compound subject, i.e. a subject that has more than one item in it, and consists of a choice, for example, "The cat or the dog ran after the mouse." The compound subject in this sentence needs a singular verb.