MATLAB: Summing the row of a matrix that meet a condition from another matrix

Question

I need help please and thanks for looking into this

I have two Matrixes with the same size as A and B. As the following

 
A = [1, 0, 0; 0, 0, 3; 1, 0, 0];
B = [2, 4, 5; 4, 3, 1; 4, 6, 1];

I would like the sum the columns in B for every row only for the same index in A that has zero. This should be done for every row to get:

C = [9; 7; 8]

Answer 1

C = sum(B.*(A==0), 2);