The volume of a pyramid is given by
V = (1/3)Bh
where B is the area of the base and h is the height (12 units).
The base is a right triangle, with sides 6 and 8, so its area will be
B = (1/2)(6 units)(8 units) = 24 units²
Putting the numbers into the volume formula, we have
V = (1/3)(24 units²)(12 units)
V = 96 units³
The appropriate choice is ...
B) 96 units³