To answer this question, we need to get the unit rate for each apartment. In this case, we have:
A.
830/75 = 11.067 euros/m^2
B.
1050/84 = 12.5 euros/m^2
C.
1225/102 = 12.01 euros/m^2
Then, from least to greatest, we have that the answer is:
A (11.067) < C (12.01) < B (12.5) or A, C, B {11.067, 12.01, 12.5}.