Two children of equal mass sit on opposite ends of a massless 4.0 m seesaw that is initially in rotational equilibrium about its central pivot. One child scoots 0.20 m closer to the pivot. Which of the following actions will best restore rotational equilibrium?
a) The other child moves 0.20 m farther from the pivot.
b) The other child moves 0.10 m closer to the pivot.
c) The other child moves 0.20 m closer to the pivot.
d) The other child moves 0.40 m closer to the pivot.