Answer :
Cytosine could be inserted as a mutation in the sequence. Cytosine is one of the four primary bases found in DNA and RNA, alongside adenine, guanine, and thymine. It is a pyrimidine subsidiary, with a heterocyclic sweet-smelling ring and two substituents joined. The nucleoside of cytosine is cytidine.
The nucleotide that can be inserted as a mutation in the sequence is cytosine. The four nucleotides in DNA are Guanine, Adenine, Cystosine, Thymine. From the choices given the only one that is a nucleotide is cytosine. Since thyme is an herb that can be used for cooking.