193. You are ordering a new block to use with a 3-inch circumference manila line. Which represents a proper size block for this line?

A properly sized block for manila line requires a cheek approximately three times the line's circumference and a sheave approximately twice the circumference. For a 3-inch circumference line, this corresponds to a 9-inch cheek and a 6-inch sheave, ensuring sufficient bending radius and preserving line strength.