Answer: Answer is A!
Step-by-step explanation: I know im very late, but to people who need the answer to this question it is A.) 80.
Here's how you get to 80 for the total volume.
First you take 4x8 that equals 32. Then do 32x0.5 or 1/2 and that gives you 16! Then finally you take your last digit 5 and multiply 16 by 5. That gives you 80. Here's the formula on how to find the volume for a right triangle: b x l x 0.5 x h! B stands for base, L stands for length, and H stands for height! I'm very glad I could assist you!