What is the knot at the end of the heaving line used to pass the towing hawser called?

Correct Answer: Option D — monkey's fist

A monkey's fist is a heavy, spherical knot tied at the end of a heaving line. Its weight provides the necessary momentum for the line to be thrown accurately from a vessel to a pier or another ship, facilitating the transfer of heavier towing hawsers or mooring lines.