Could somebody answer this please and explain how you got the answer, this is so confusing ♀️

Answer:
Answer is D
Step-by-step explanation:
Radius of cylinder and cone = r
Volume of cylinder - πr²h = π . 36 . 16 cm³
Volume of cone - πr²h/3 = π . 36 . 9 /3 cm³
Volume of feed = 36π.19 = 684 π cm³