Which of the following sentences uses possessive nouns correctly?
a. the two sisters’ gift to the charity’s drive was a pile of hand-sewn children’s clothing.
b. the two sister’s gift to the charitys’ drive was a pile of hand-sewn childrens’ clothing.
c. the two sister’s gift to the charity’s drive was a pile of hand-sewn children’s clothing.
d. the two sisters gift to the charitys’ drive was a pile of hand-sewn childrens’ clothing.