Riddle

What begins with ?e,? ends with ?e,? but only contains one letter?

Choose an answer

A.Eye
B.Eraser
C.Exercise
D.An envelope
Hint: It's a 2-word phrase with 10 letters, starting with "A".

Answer

An envelope

Why this is the answer

An envelope is a paper container that holds a 'letter' of mail.

This riddle is filed under Riddles for Adults and rated Easy.