Choose the correct one.

a. RNA is more stable than DNA is incorrect. RNA is less stable than DNA because it is more susceptible to hydrolysis.
b. RNA has ribose sugar is correct. RNA contains ribose sugars rather than deoxyribose sugars, which makes RNA more unstable and more prone to degradation.
c. DNA is chemically more reactive than RNA, which is incorrect. RNA, containing ribose sugar, is more reactive than DNA and is not stable in alkaline conditions.
d. 2'OH allows RNA to adopt B-conformation is also incorrect. The most common mechanism is through the ability of 2′-OH groups to provide hydrogen bond (H bond) donors and acceptors.