Which of the following options correctly lists three evolutionary adaptations that help some animals directly exchange matter between the cells of their body and the environment?

A) a gastrovascular cavity, a body with two tissue layers, and a torpedo-like body shape
B) an external respiratory surface, a small body size, and a two-cell-layered body
C) a large body volume, a long, tubular body, and thin covering
D) an unbranched internal surface, a small body size, and thick covering