Which Statement About Circulatory Systems Is False

Which statement about circulatory systems is false?

A) Arthropods and mollusks have open circulatory systems.
B) Vessels return hemolymph to the mollusk heart.
C) In the arthropod heart, hemolymph flows into the heart through ostia when the heart relaxes and out of the same ostia when the heart contracts.
D) Ostia have valves that help regulate the flow of hemolymph.
E) Arthropods have a tubular heart running along the dorsal surface.