Answer :
At the transcription level, gene regulation could occur.
So, the correct option is C.
Although it can happen at any stage of gene expression, transcription—the process by which the data in a gene's DNA is transferred to mRNA—represents the stage where gene regulation happens most frequently. Transcription factors are proteins that become active in response to environmental or cellular signals. RNA polymerase regulates transcription, which is where most of the regulation of gene expression in bacteria takes place.
In eukaryotes, transcriptional initiation is where gene regulation is most crucial. During the processes of protein translation and transcription, which both take place in the cytoplasm and nucleus, respectively, eukaryotic gene expression is controlled. Through the post-translational modification of proteins, additional regulation may take place.
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