Q. Which one of the following is NOT a luminous object?

[A] Sun

[B] Electric Lamp

[C] Candle

[D] Moon

Answer: D
Notes:

Moon is a non-luminous object because as we know that luminous objects emit light on their own while non-luminous objects emit light with the help of luminous objects. 

Here sun is a luminous object so moon takes light from the sun and emits light in our surrounding and our environment. 

Source: G C Leong