Bob and Carol are both observing the moon at exactly the same time. However, Bob is in Miami and Carol is in Los Angeles. Bob observes the moon in the waning gibbous phase. In what phase will Carol observe the moon to be?

Waning gibbous.

Explanation:

The moon appears the same everywhere on Earth. Only people on opposite sides of and far away from the equator see the moon upside down, but Miami and Los Angeles are not far away from the equator so Bob and Carol observe the same moon phase.