Options are:
(1). Changing mass.
(2). Absorbing energy.
(3). Electrical energy.
(4). Condensation.
(5). Lack of light.
(6). rays or beams.
(7). colors of the spectrum.
(8). electricity.

Fact 1: Absorbing sunlight causes objects to heat. Fact 2: Sunlight is the ultimate form of energy. Given the two facts above, what can cause objects to heat?
Answer:
(2).