Riddle

Round as an apple, deep as a cup, and all the king's horses can't fill it up. What is it?

Choose an answer

A.A bucket
B.A cup
C.A hole in the ground
D.A well
Hint: It's a 2-word phrase with 5 letters, starting with "A".

Answer

A well

Why this is the answer

A well's shaft goes so deep into the earth that no amount of water poured in from above can ever fill it to the top.

This riddle is filed under "What Am I?" Riddles and rated Easy.