Answer:
B. 343 ft³
Explanation:
To find the volume of the prism, multiply these sides from left to right.
Volume:
⇒ V=L*W*H
Length: 7
Width: 7
Height: 7
Then you solve.
Multiply.
7*7*7=343
343ft³
Therefore, the final answer is B. 343ft³.
I hope this helps, let me know if you have any questions.