The volume of a rectangular prism is given by:
V = lwh
twice the length: 2l, twice the width: 2w , half the height 1/2h:
The volume of new prism:
2l*2w*1/2h
Factor:
2*2*1/2*l*w*h
So the volume is twice the original volume.
Thus the Answer is A) the volume is doubled.