20. When can we observe a meteor?

A. A meteor is observed when a meteoroid passes through the Neptune's atmosphere and burns up in the process

B. A meteor is observed when a meteoroid passes through the Pluto's atmosphere and burns up in the process

C.A meteor is observed when a meteoroid passes through the Mar's atmosphere and burns up in the process

D.A meteor is observed when a meteoroid passes through the Earth's atmosphere and burns up in the process​