Question

what type of bend is used to join the skiff hook line to the towline?
square knot
double becket bend
bowline
clove hitch

Explanation:

In nautical knot - tying, the Double Becket Bend is specifically used to join the skiff hook line to the towline. The Square Knot is mainly for joining two ropes of equal diameter for general purposes, not for this specific towline - skiff hook line connection. The Bowline is used to form a fixed loop at the end of a rope. The Clove Hitch is used to attach a rope to a pole or another rope in a temporary way, not for this joining task.

Answer:

B. Double Becket Bend