If the threads and gasket of a fire hose coupling are in good condition, the minimum mechanical advantage necessary for making a watertight connection to another hose coupling, can be developed with __________.

Correct Answer: Option A — your hands

Fire hose couplings are designed with gaskets to ensure a watertight seal when properly tightened. If the threads are clean and the gasket is in good condition, hand-tightening is sufficient to achieve the required seal. Over-tightening with a wrench can damage the threads or deform the gasket, leading to leaks.