What Conclusion Can You Draw from the Accompanying Figure

Multiple Choice

What conclusion can you draw from the accompanying figure?

A) Without direct contact, mussels can sense the presence of crabs.
B) Mussels can sense the presence of crabs only visually.
C) Mussels are increasing their shell thickness in response to water current.
D) Shell thickness is a non-inducible defense.
E) Crabs hunt for mussels by focusing on the chemicals they emit into the water.