Which sentence shows correct apostrophe use?
a). whose coming to marta’s party?
b). who’s coming to marta’s party?
c). who is coming to martas party?
d). who’s coming to martas’ party?

Sentence B shows a correct apostrophe use.

Explanation:

The first apostrophe is the contraction of the verb to be in its singular form (is). Then, the second one, is the one indicating possession since it either denotes that Marta is the one throwing the party or the one to whom the party is thrown for. The general rule to form the possessive with an apostrophe is to add the apostrophe and -s. (Marta/Marta's).

is that the whole question?