Answer:
it would be C. h=32 cm
Explanation:
the formula for area of a triangle in A=1/2*b*h
so plug what you know into the formula, you know the area, A, and the base, b, so:
64=1/2*(4)*h
now solve what you can:
64=2h
then divide each side by 2 to get h, or the height, alone:
32=h
so, the height is 32 cm!
im sorry if this didnt make sense, but i hope this helped!! :D