Can you solve this? Give whole solution not only answer :)

Noone?

The soultion could be a straight horizontal line, even it's not in the possible answers.

Big boxes are 3 units and small boxes are 1. I am taking the difference between columns B and C on each row and putting the result in A. I pick answer c), because the two small boxes on the right cancel out, one large box on the left cancels out, and the difference between one small box and one large box is 2 units, which is what is shown on the lower right figure.

I would like to answer C....