Answer:
The correct answer is D RNA polymerase is using a single strand of the DNA molecule as a template for mRNA production.
Step-by-step explanation:
RNA polymerase play an important role in the formation of mRNA from DNA molecule in the nucleus by a process known as transcription.
During transcription RNA polymerase binds to the coding strand of DNA molecule and helps in the synthesis of mRNA strand by the addition of specific nucleotides complementary to the nucleotides present in DNA molecule. The nucleotides get attached to each other by phosphodiester bond.