Answer
(b) lower than
Work Step by Step
Since the moon is smaller in size, the gravity on it is smaller, too. Since the time taken by the ball to reach the batter is the same (because the motion in the horizontal direction is independent of the motion in the vertical direction), the ball will fall less in the same time that it did on the earth.
Since the ball goes down by less, the pitcher needs to raise the hand by a smaller amount.