50 POINTS!! Identify the first step of DNA transcription below.

A) The RNA polymerase binds to a DNA molecule and separates its two strands.

B)Specific base sequences on the DNA molecule signal where the RNA polymerase should begin transcribing a section of mRNA.

C) Other base sequences on the DNA then signal that the new mRNA molecule is complete, and transcription stops.

D) One strand of the DNA serves as a template to assemble nucleotides together into a complementary mRNA strand.