Fact 1: If gas is heated then that gas will expand. Fact 2: An increase in temperature causes a gas to expand. Given the two facts above, what affects a gas?

Choices:
(1). electricity;
(2). kinetic energy;
(3). temperature;
(4). Evaporation;
(5). salinity;
(6). Pollution;
(7). wind;
(8). magnetism;
Answer:
(3).