Verified answer

since 126C>0C> -42C then A

Propane boils at -42C which means in OC (freezing point of water) it is a gas. So clear.

Clearly, only the propane is a gas at 0C.

--------------------- |---------------------| --------------------- ----------|----------- Temperature

-100C .........-42C .................0C ..........................126C

............propane boils ..... H2O freezes........... Octane boils

Propane is a gas at any temperature above -42C. Octane is not a gas until the temperature reaches 126C.

========= Follow up =========

I fear Willy has missed the point. We're not worrying about propane as a liquid except that the liquid boils at -42 to become a gas. Therefore, propane will still be at a gas as it warms up to 0C. But octane is a liquid at 0C since it's melting point is at -57C, and octane won't begin boiling until the temperature reaches 126C. Again, at 0C propane is a gas and octane is not.

Answer: A propane

Why: when something boils it changes from a liquid to a gas. water freezes at 0DC ( degrees celseius) propane is still a gas when the temperature reaches 0DC.

Propane:

Melting point

−187.7 °C, 85.5 K, -305.9 °F

Boiling point

−42.1 °C, 231.1 K, -43.8 °F.

Octane:

Melting point

−57 °C, 216 K, -71 °F

Boiling point

125.52 °C, 399 K, 258 °F

Water 0C or 32F