First prism= 3*3*3= 27 cubic
Second prism= 7*3*3= 63 cubic
Third prism= 10*3*3= 90 cubic
You add all three cubic together 27+63+90 and you get 180 cubic units
So C.180 cubic units is correct answer
Please mark me as ''The Brainliest Answer" please!!!!!!!!!!!