Nouns are words that name people, things, places,
animals, etc.
When a noun ends with an 'f' or an 'fe', we form the plural noun by adding a 'ves' to it ('fe' in 'wife').
Option B: 'Wives' is the plural form of the noun
'wife'.
Hence option B is correct.
Option A: 'Wife' is a singular noun that names a relation. It's not a plural noun and hence A is wrong.
Option C is wrong because 'A': 'wife' is not a plural noun.
Option D is wrong because the answer lies in B.