A.) Their
Their sister is happy to babysit, so you mustn't worry about it.
Their is the 3rd person plural adjective. It is used to describe something or someone that belongs to them.
They're is a contraction of "they are" and it is most often followed by a present participle or a verb that ends with -ing.
Answer:
C is the correct answer.
As she left the concert hall, Shonda was as bright as the sun, (as her recital was a brilliant success,) and Mozart could not have played the piece better.
Explanation:
