A lichen is a fungus that grows in close relationship with algae. Lichens can be found growing on tree trunks and rocks, and can be harmed by acid rain. A student tests how the pH of the surface beneath the lichen affects its response to acid rain. In an experiment, the student grows lichens on artificial surfaces and sprays them with a solution that mimics acid rain. The table summarizes the experiment.
What conclusion can be drawn from the experiment?
A) White lichens are healthier than dull green lichens.
B) Surfaces with lower pH levels protect lichens from acid rain.
C) Surfaces with higher pH levels protect lichens from acid rain.
D) Brownish yellow lichens are healthier than light green lichens.