Available choices:
(1). sun's heat;
(2). sunlight beams;
(3). refraction of light;
(4). heat energy;
(5). visible energy;
(6). by indirect light;
(7). produce light;
(8). Positive charges;
Given those answer options, answer the question: Fact 1: Phytoplankton are bacteria and algae that use sunlight to make food. Fact 2: Sunlight beams down on the different types of algae. Given the two facts above, phytoplankton use what to make food?
A:
(2).