Topic: Subject Verb Agreement,

Best Answer Explained in Below-:

The correct choice in the sentence "He and I _____ well." is C) are. This is primarily due to the rules of subject-verb agreement in English.

In this sentence, "He and I" together form a compound subject that refers to two people: "He" and "I." When a compound subject is formed by two or more singular nouns or pronouns connected by "and," the subject is treated as plural. Consequently, the verb must also be in its plural form to agree with the plural subject.

The verb "are" is the plural form of "to be," which is used with plural subjects. Conversely, the options "am" and "is" are singular forms and would not correctly agree with a plural subject. "Am" is used only with "I," while "is" is used with third-person singular subjects (he, she, it). The option "been" is a past participle and does not function as a main verb in this context.

Therefore, the correct verb to complete the sentence is "are," making "He and I are well" grammatically correct and meaningfully coherent.