In sentences, a singular subject must be followed by a singular verb; Otherwise, there is a subject-verb match error because the subject in number (singular plural) does not correspond to the verb. The wrong verb is “believe” and the correct form of it is “believes” This error occurs in the sentence represented because the subject is “the group” singular and this is followed by the current verb “believe” used with plural subjects like us or them. This means that the correct verb form is “the group that gathers to protect Lake Tahoe believes, since in this way the subject and the verb are singular. Explanation: I have a show called ixl and I had the same question and I got it wrong and I got the answer okay, that`s how I did it We understand it: You didn`t come here for commercials. But ads help us give you free access to Brainly. Please consider whitelisting us!. . .