A newly discovered virus with single-stranded nucleic acid molecule is found to contain both uracil (U) and thymine (T). Which of the following is the most likely explanation for this unusual observation?
A. The molecule is a product of RNA editing, where cellular enzymes have modified the RNA sequence after transcription.
B. The molecule is a hybrid of DNA and RNA, formed through a novel replication process.
C. The molecule is a contaminant from a different organism, accidentally introduced during sample preparation.
D. The molecule is a degradation product of DNA, where some thymine residues have been deaminated to uracil.