B. he, she, it will have become
As you may know, third person is when the pronouns he, she, it, her, his, him, they, them, etc. is used. Future tense will frequently require the use of “will” because it is something that will happen/has not yet happened. Perfect tense refers to something that has been completed. Thus, future perfect tense is for something that will have been completed in the future and typically have the words “will have.” An irregular verb is a verb that does not follow convention of adding an “ed” to make it past tense. Irregular verbs will be in the present tense (such as “become”) in order to be grammatically correct in the future perfect tense. Thus, the future perfect tense that uses the irregular verb “become” is he, she, it will have become
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