Question

what is mechanical advantage?
an advantage we get from using water.
an advantage we get because the force is opposing the effort.
an advantage we get by using a machine.

Explanation:

The first option mentions water, which is not related to the definition of mechanical advantage. The second option refers to the resistance force opposing the effort, but mechanical advantage is about the machine's effect, not just the resistance - effort relation. The third option aligns with the given text that mechanical advantage is an advantage from using a machine.

Answer:

An advantage we get by using a machine.