C. That jacket is the same size and color as yours
Possessive pronouns DON'T have an apostrophe
The other three answer choices don't make sense because...
A. It would have to be "hers" not "her's." "Her's" basically means "her is." Does this make sense: The story about the brave knight is her is. No!
B. It would have been "its" not "it's." "It's" means "it is." Does this make sense: Our dog left it is bone in the back yard. No!
D. It would have been "hers" not "her's." "Her's" means "her is." Does this make sense: Her is old shoes need new laces. No!
Therefore the answer is C. That jacket is the same size and color as yours.
Hope this helped!
~Just a girl in love with Shawn Mendes