Final answer:
The missing part of the sentence "Calvin sold his..." is the object, which should be a noun that Calvin sold. Therefore, the correct option is d) Object.
Step-by-step explanation:
Understanding the structure of a sentence is vital in English grammar. To answer the student's question: In the statement "Calvin sold his which sentence compound is missing an object be a noun see a verb"? - we need to identify which option is missing an object. An object in a sentence traditionally follows a verb and completes the meaning of the action by answering "whom" or "what."
In the given sentence fragment "Calvin sold his...", the subject is already mentioned ('Calvin'), and so is the possessive adjective ('his'), which modifies the object. 'Sold' is the verb; hence what is missing from this sentence is the object itself. It is the thing that Calvin sold. The correct missing part of the sentence should be a noun that acts as the object. Therefore, the correct option is d) Object. It completes the action started by the verb and is necessary for the sentence to make sense. The object typically refers to the noun, noun phrase, or pronoun that receives the action of a verb. Without an object, we are left wondering what Calvin sold, and the sentence remains incomplete.