Nouns are words that name people, things, places,
animals, etc.
We form the plural noun by changing the vowel in the singular noun 'woman'. ('e' replaces 'o' in woman).
Option B: 'Women' is the plural form of the noun 'woman'. Hence option B is correct.
Option A: 'Woman' is a singular noun that names a female human being. It's not a plural noun and hence A is wrong.
Options C and D: ''Woman's' is a singular noun (woman) in the possessive case ('s refers to possession).
Women's is a plural noun in the possessive case. But, the sentence does not indicate any possession.
Hence these options are wrong.