Riddle

I can fill any space, float, and disappear. Never touching the ground I help others get around. What am I?

Choose an answer

A.A balloon
B.Steam
C.Smoke
D.Gas
Hint: It's a word with 3 letters, starting with "G".

Answer

Gas

Why this is the answer

Gas can expand to fill any container, float upward if lighter than air, and quickly dissipate, and fuel-based gas literally helps vehicles 'get around.'

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