Riddle

I make a loud sound when I'm changing. When I do change, I get bigger but weigh less. What am I?

Choose an answer

A.A balloon
B.A firecracker
C.A seed
D.Popcorn
Hint: It's a word with 7 letters, starting with "P".

Answer

Popcorn

Why this is the answer

Kernels pop loudly, expand in size, and become lighter.

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