The sentence that does not contain any errors is A.
B has "They're house" which is a contraction of "They are" and "They are house was just painted blue." is incorrect grammar.
C has "There house", There is not a possessive which is needed in this case, so it is also incorrect.
D is the same thing as A, except it does not have the apostrophe, making it even less correct
Hope this helped :)
