Let's look at each answer choice's words per minute:
A) 320/8 = 40
B) 600/12 = 50
C) 350/10 = 35
D) 225/5 = 45
The fastest is 50 words/min which is B
if its wrong that means you didn't explain it correct tell me if its wrong and ill solve it correctly if you say what's the width, length and height the answer is down below.
Answer: 236 in²
I belive your answer is 320
Happy to assist you!