Which of the following sentences contains a grammatical error?

The first sentence contains a grammatical error due to the subject-verb agreement. The word "team" is a collective noun that is generally treated as singular in American English. Therefore, it should be paired with a singular verb form. In this case, the correct phrase would be "The team is winning the game," which uses "is" to denote that the team functions as a single unit.

In contrast, the other sentences correctly use agreement between subjects and verbs. The second sentence correctly uses "plays" with "team," the third uses "are" with "players," and the fourth uses "is" with "team." Each of these sentences maintains proper subject-verb agreement based on the nouns they refer to, reinforcing their grammatical accuracy.