After the generation of the RNA would indicate that C. It is controlled after transcription
Now it could also be translation (because that is after the protein is made) - but because your question asks specifically after the RNA is formed (that process is called transcription) that would indicate that your answer is C.
Gene expression is a process that involves synthesis of a final gene product by using information present in a gene. It is regulated at various level to decrease or increase the production of these gene products, known as gene expression control.
Transcription includes formation of RNA molecule from a template DNA strand. Therefore,it gene expression is controlled after the formation of RNA, it is known as controlled after transcription.
Thus, the correct answer to be filled in the blank is option (C).
The difference between a controlled variable and a constant is that a constant variable does not change through the experiment and a controlled variable can change.
