The answer is (3) 566 K. For this problem, you need the combined gas law, which is P1V1/T1 = P2V2/T2 (variables represent Pressure, Volume, and Temperature). You are looking for T2, so you get T2 = P2V2T1/P1V1 = (38.7)(1880)(273)/(79.0)(444) = 566 K.
Viscosity is how well a liquid can flow were as density is the mass per unit volume so if you heat up oil it will become less viscose and flow easier while its density remains about the same.
50cm3 of air is less dense than 50cm3 of lead as though they occupy the same volume their mass is different
hope that helps