According to the law of conservation of mass, the chemical formula of substance C is () A.A2B B.AB2 C.AB3 D.AB Why C? Who can explain

According to the law of conservation of mass, the chemical formula of substance C is () A.A2B B.AB2 C.AB3 D.AB Why C? Who can explain

2ab2 = 2 A, 4 B
B2 = 2 b
They add up to two A's and six B's
The front coefficient of C is 2, so it's all divided by 2, which is 2ab3, that is, C = AB3