Final answer:
The pronoun that could correctly complete the sentence is 'His.' 'His' is the correct pronoun to use because it shows possession.
Step-by-step explanation:
The pronoun that could correctly complete the sentence is c) His.
In the sentence, 'The book belongs to __,' 'his' is the correct pronoun to use because it shows possession. The pronoun 'his' indicates that the book belongs to someone.
For example, if we complete the sentence with 'his,' it would be 'The book belongs to his.' This shows that the book is owned by someone and the pronoun 'his' refers to the person who owns it.