ok, so we gots a pyramid+rectangular prism
a pyramid is 1/3 the volume of a rectangular prism with same length width and height
so
volumerectangularprism=length times width times height
vrectangular prism=7 times 6 times 3.55=149.1
then the pyramid
the volume is 1/3 times 7 times 6 times 3=42
so add them to get total
149.1+42=191.1 cm³
B is answer