Answer :
The force that the pedal exerts on the water causes the boat to move in the forward direction.
According to the third law of motion proposed by Newton, for every action force there is an equal and opposite reaction force generated.
When the man paddles it exerts a force on the water, in return the water also exerts a force on the boat of the man.
Because the mass of the man is very very less in comparison to the water body.
The water body does not move backward but the force applied by The Man on the water body makes the boat to move forward.
So we can conclude here the force that the pedal exerts on the water body causes the boat to move in the forward direction.
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