When soaking the hole, which measurement determines the percolation rate?

When soaking the hole, which measurement determines the percolation rate?

• A. The time for a drop from 9 inches to 6 inches divided by three.
• B. The time for a drop from 6 inches to 3 inches divided by three.
• C. The time for a drop from 9 inches to 3 inches divided by six.
• D. The time for a drop from 9 inches to 6 inches divided by two.

Answer: (A)