Answer: The correct answer for the fill in the blank is A) Transcription.
Transcription is a process in which genetic information ( present in the form of nucleotide sequence) from DNA (deoxyribonucleic acid) is copied into a strand of mRNA (messenger RNA) with the help of enzyme RNA polymerase.
It is the initial process of gene expression.
The mRNA thus formed is further translated to form desirable protein.
Thus, during the process of transcription, the genetic message from DNA is transformed to mRNA.