What is the main structural difference between furanoses and pyranoses?

• A. Furanoses have a six-membered ring, while pyranoses have a five-membered ring.
• B. Furanoses have a five-membered ring, while pyranoses have a six-membered ring.
• C. Furanoses are more stable than pyranoses.
• D. Furanoses have more carbon atoms than pyranoses.

Answer: (B)