The process shown at point Y is known as Transcription (Option D).
What is transcription?
Transcription is the process by which an RNA molecule is synthesized from a DNA template. It involves the reading of a specific segment of DNA (a gene) and the synthesis of a complementary RNA molecule.
This newly synthesized RNA molecule, known as messenger RNA (mRNA), carries the genetic information from the DNA to the ribosomes, where protein synthesis (translation) occurs.
Given that the process at point Y in the diagram involves the synthesis of RNA from DNA, the correct answer is: D. Transcription.