Read the scientific question below.
 "Is air pollution related to lichen growth?"
 What is a likely hypothesis for the question? (5 points)
 a
 Air pollution must affect lichen growth.
 b
 No, air pollution does not affect lichen growth.
 c
 If air pollution is high, then lichen growth is high.
 d
 If air pollution is high, then lung disorder cases are high.