The following diagram shows various positions of the moon in its orbit around earth. the image of the moon shows its phase as seen from earth. earth is shown with a bigger circle on the right is a bigger circle labeled as sun. two lunar phases are shown. first quarter is shown above earth and the third quarter below earth. arrows are drawn in the counter clockwise direction. position a is marked on the left of earth, position b is marked halfway between position a and the third quarter. position c is marked on the right of earth, position d is marked halfway between position c and the first quarter. in which position will three-fourths of the illuminated side of the moon be visible from earth? a b c d