Choices: (I). sunlight energy (II). water energy (III). heat energy (IV). heat produced (V). chemical energy (VI). mechanical energy (VII). organic matter (VIII). refraction of light
Q: You are presented with the quiz "Phytoplankton have a clever way of making food from what?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "phytoplankton are bacteria and algae that use sunlight to make food" and "plants have a very clever way of using the energy from sunlight to make their food". So, what's the best answer to the question?
A:
(I).