Which One of the Following Statements Is True About Animals

Which one of the following statements is true about animals that do not have circulatory systems?

A) They do not have tissues and organs.
B) They may rely on diffusion for the transfer of gases, nutrients, and wastes.
C) There are no animals without circulatory systems.
D) They tend to have large bodies.
E) The body cells are typically distant from the source of the oxygen, so the gas has to diffuse through several layers to reach all cells.