The answer to this question would be D or 1512. to solve this question, you find the volume of each prism. to find volume, you do length times width times height. the top prism would be 15 times 12 times 6 which would be 1080 the bottom prism would be 6 times 12 times 6 which would be 432. you add the volumes of the two prism or 1080+432= 1512.