Why does conduction occur in solids and liquids easier compared to gases?

options:

because the particles in gases are closer together and move slower

because the particles in gases are farther apart and move faster.

because the particles in gases are closer together and move faster.

because the particles in gases rarely move.

The flame produced by the burner of a gas (propane) grill is a pale blue color when enough air mixes with the propane (c3h8) to burn it completely. for every gram of propane that flows through the burner, what volume of air is needed to burn it completely? assume that the temperature of the burner is 195.0°c, the pressure is 1.05 atm, and the mole fraction of o2 in air is 0.210.