The correct statement regarding RNA and DNA, respectively is:

Solution & Explanation

\textbf{Answer:} (B) RNA contains D-ribose; DNA contains $2^{\prime }$-deoxyribose. \textbf{Solution:} The pentose sugar in RNA is D-ribose, which bears an $-\mathrm{OH}$ group at the C-$2^{\prime }$ position. DNA contains $2^{\prime }$-deoxyribose, in which the C-$2^{\prime }$ $-\mathrm{OH}$ is replaced by $-\mathrm{H}$. Arabinose is not a constituent of either nucleic acid, so only option B correctly pairs the two sugars.