Riddle

Many have heard me, but nobody has seen me, and I will not speak back until spoken to. What am I?

Choose an answer

A.An echo
B.A rumor
C.A whisper
D.Echo
Hint: It's a word with 4 letters, starting with "E".

Answer

Echo

Why this is the answer

An echo repeats sound back to you but only after you make a sound first, and it has no physical form to be seen.

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