Mary and Debra Stand on a Snow-Covered Roof

Mary and Debra stand on a snow-covered roof. They both throw snowballs with the same initial speed, but in different directions. Mary throws her snowball downward, at 30° below the horizontal; Debra throws her snowball upward, at 30°. When the snowballs reach the ground below,

A) Debra's snowball will stay in the air longer than Mary's.
B) Mary's snowball will stay in the air longer than Debra's.
C) Both snowballs will take the same amount of time to hit the ground.
D) Debra's snowball never hits the ground since it is thrown upwards.
E) Mary's snowball never hits the ground since it is thrown downwards.