Final answer:
The sentence 'Sam, together with his wife, guests of the party ___' requires a singular verb due to 'Sam' being the subject. The correct choice from provided options is 'greets' (option a)).
Step-by-step explanation:
The question is about appropriate verb conjugation to form a coherent sentence. In the sentence 'Sam, together with his wife, guests of the party ___', we need to fill in the blank with a verb that aligns with the subject 'Sam'. The subject of the sentence is 'Sam', not 'Sam and his wife', because the phrase 'together with his wife' is just giving additional information. Therefore, a singular verb form needs to be used. Out of options a), b), and c), the correct one to use is 'greets' (option a)), as it corresponds with the singular subject 'Sam'. Thus, the full sentence reads 'Sam, together with his wife, greets the guests of the party'. The other options either use a plural verb form or don't fit grammatically in the sentence.
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