She is my mother-in-law. Which punctuation mark is used in the sentence?

She is my mother-in-law. Which punctuation mark is used in the sentence?
A: Exclamation
B: Apostrophe
C: Hyphen
D: None of these

“Mother-in-law” is a compound noun with hyphens. Apostrophes indicate possession or contractions; not compounds. No exclamation is present.