Step 1: Grammatical analysis of each sentence.
- Sentence A: Grammatically sound. The pronoun "his" correctly modifies "Everybody." - Sentence B: Grammatically unsound. "Have" requires the singular form "has" to agree with the singular subject "Nobody." - Sentence C: Grammatically sound. "Either" is singular, making the verb "is" appropriate. - Sentence D: Grammatically unsound. The verb "is" should be "are" to agree with the plural subject "mice." - Sentence E: Grammatically sound. The construction "It is I" is acceptable in formal English. - Sentence F: Grammatically unsound. The objective case is incorrect; "him and me" should be used instead of "He and I."
Step 2: Evaluation of sentence combinations.
- Option 1 (B, D & F): Sentences B, D, and F are incorrect.
- Option 2 (B, C & D): Sentences B and D are incorrect.
- Option 3 (A, C & E): Sentences A, C, and E are correct.
- Option 4 (A, E & F): Sentence F is incorrect.
- Option 5 (C, D & F): Sentences D and F are incorrect.