Riddle

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

Choose an answer

A.A bucket
B.A barrel
C.A fountain
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 is round like the cross-section of an apple and deep like a cup, yet said to be so deep that even an army's worth of horses couldn't fill it up.

This riddle is filed under Hard/Difficult Riddles and rated Easy.