Riddle

I make noise yet you don't see me make it. I alarm for good yet sometimes for worse. I have a companion. What am I?

Choose an answer

A.Lightning
B.A siren
C.A doorbell
D.Thunder
Hint: It's a word with 7 letters, starting with "T".

Answer

Thunder

Why this is the answer

Thunder is heard, not seen, can signal danger (a storm) or simply nature putting on a show, and it always follows its 'companion,' lightning.

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