Answer
B, aquatic energy transfers are usually more efficient than land energy transfers because algae do not make lignin.
Work Step by Step
Lignin is a chemical that is produced by animals on land. It is indigestible and requires high amounts of energy to make it. Hence, primary consumers will waste the lignin and waste the energy it carries along. This is not the case for aquatic animals, though, because algae do not produce lignin, which means no energy is going to waste producing lignin.
