Final answer:
The volume of the rectangular prism is 288 cm³.
Step-by-step explanation:
To find the volume of a rectangular prism, you need to multiply its length, width, and height. In this case, the length is 8 cm, the width is 4 cm, and the height is 9 cm. So, the volume is 8 cm x 4 cm x 9 cm = 288 cm³.
Therefore, the correct answer is b) 288 cm³.