Question

Which sentence uses a contraction or possessive form incorrectly?

A.
I'm not sure who's purse is on that chair.

B.
The blue house on the corner is theirs.

C.
Your cousin is on my softball team.

D.
Do you know whether they're lost?
I think it's A.

Answer 1

hmmm, i believe its B

Answer 2

their's :P

Answer 3

Wouldn't that be their-is?
I think it is A because it turns it into who-is instead of whos

Answer 4

its not who-is, its who's as a possessive

Answer 5

Oh, alright then. B :p

Answer 6

lol

Answer 7

http://www.elearnenglishlanguage.com/blog/english-mistakes/theirs/
theirs is correct their's is incorrect