Answer:
C
Explanation:
C. The relationship is proportional
A is wrong because if we take the first column for e example... 90/3 is 30, not 9
B is wrong because of the same reason, it was 30 and that says 20.
D is wrong because if one classroom is 30, that means two is 60.. not 120
C is right because 3x30 is 90, 4x30 is 120, and so on