Final answer:
The correct sentence is 'B. Bingo is the name of the boy's dog,' as it appropriately uses an apostrophe before the 's' to indicate that one boy owns the dog, making it a singular possessive noun.
Step-by-step explanation:
The correct use of an apostrophe to show possession depends on whether the noun is singular or plural. In the case of 'Bingo is the name of the boy's dog,' we are talking about one boy owning a dog, making it a singular possessive noun. Therefore, the correct option is:
B. Bingo is the name of the boy's dog.
This correctly uses the apostrophe before the 's' to indicate that the dog belongs to one boy. If 'boys' was meant to be plural, implying that the dog belongs to multiple boys, the apostrophe would be placed after the 's' as in 'the boys' dog.' In the sentence given, the proper use aligns with the rule that an apostrophe plus 's' is added to singular nouns to indicate possession.