The correct answer is C) take a turn around the cleat, then figure-eights, and a half-hitch. This is the correct method for securing a tow line to a cleat because it provides a secure and reliable connection. Taking a turn around the cleat first creates a base for the line, then the figure-eights add additional wraps to hold the line in place, and the final half-hitch helps to prevent the line from slipping off the cleat. This sequence is recommended in various maritime regulations and guidelines for proper line handling and mooring techniques. The other options are incorrect because they either do not provide a secure enough connection (option B) or use a less-than-optimal knot sequence (options A and D).