Riddle

I cannot be felt or moved, but as you come closer, I get more distant. What am I?

Choose an answer

A.A rainbow
B.A mirage
C.A shadow
D.Horizon
Hint: It's a word with 7 letters, starting with "H".

Answer

Horizon

Why this is the answer

No matter how far you travel toward the horizon, it always recedes and stays the same distance away -- it can't be touched or physically shifted.

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