Task: Question Answering
Input (English): Why do multicellular organisms need transport systems?  
 (A) Most have cells that are not able to exchange gases with the outside environment. (B) Most have cells that are unable to grow and survive in their environment. (C) Most have cells that need food from sources outside their environment. (D) Most have cells that require more energy to survive than single-celled organisms.
Output (English): A