The diagram illustrates a transverse section of a stem. Which statement accurately states the position and role of phloem?
- AStructure R is phloem and transports amino acids and starch.
- BStructure S is phloem and transports amino acids and starch.
- CStructure R is phloem and transports amino acids and sucrose.
- DStructure S is phloem and transports amino acids and sucrose.