The Following Figure Shows Studies in a Stream Where Enclosures

The following figure shows studies in a stream where enclosures were set up either with trout or with no trout. Which statement is a correct interpretation of the graph about trout, invertebrates, and algae?

A) If trout are present in a system, algae production is low and invertebrate population levels are also low.
B) If trout are present in a system, algae production is high and invertebrate population levels are also high.
C) If trout are present in a system, algae production is high and invertebrate population levels are low.
D) Trout do not seem to affect the algae production; only the invertebrate populations are affected.
E) Trout do affect the algae production but not the invertebrate populations.