For each white square, we put a zero.
For each black square, we put a one.
And then we turn it on its side, like this,
zero one zero zero one one zero zero
and this we know is the two to the seventh place
two to the sixth, two to the fifth
two to the fourth, two to the third
two to the two, two to the one
and two to the zero
and two to the sixth is 64
plus two to the third is 8
plus two to the two is 4
and that's equal to 76.
So C was the right answer.