The correct response illustrating Newton's Third Law is:
When the octopus ejects the water out, the water applies an equal force on the octopus in the opposite direction.
This statement reflects Newton's Third Law, which states that for every action, there is an equal and opposite reaction. In this case, when the octopus pushes water out (the action), the water exerts an equal and opposite force back on the octopus (the reaction), propelling it forward.