Bases of RNA are -

The correct answer is Option (1) → adenine, guanine, cytosine and uracil

Nucleic acids contain two kinds of nitrogenous bases: purines (adenine, guanine) and pyrimidines (cytosine, thymine, uracil). DNA and RNA share adenine (A), guanine (G) and cytosine (C). The fourth base differs: thymine (T) in DNA and uracil (U) in RNA. So the bases of RNA are adenine, guanine, cytosine and uracil.

NCERT (2026-27 edition):
Chemical Composition of Nucleic Acids – “… DNA contains four bases viz. adenine (A), guanine (G), cytosine (C) and thymine (T). RNA also contains four bases, the first three bases are same as in DNA but the fourth one is uracil (U).”