Which set of statements correctly describes key differences between RNA and DNA?

• A. RNA typically contains ribose, uses uracil (U) instead of thymine (T), and is often single-stranded.
• B. RNA and DNA have the same sugar and bases, but RNA is shorter only because it is more chemically stable.
• C. RNA differs from DNA mainly because it uses guanine (G) instead of adenine (A) and cannot form base pairs.
• D. RNA typically contains deoxyribose, uses thymine (T) instead of uracil (U), and is always double-stranded.

Answer: (A)