What is the computed breaking strength of a 4-inch manila line?

Correct Answer: Option D — 14,400 lbs.

The standard formula for the breaking strength of manila line is 900 lbs multiplied by the square of the circumference in inches. For a 4-inch line, the calculation is 900 x (4 x 4), which equals 900 x 16, resulting in a total breaking strength of 14,400 lbs.