The Following Diagram Represents the Transcription Unit and Corresponding RNA

The following diagram represents the transcription unit and corresponding RNA transcripts as "Christmas-tree-like" structures captured in the electron micrograph.
- Which of the following statements CORRECTLY describes the reason as to why the transcription unit looks like a "Christmas tree" with different length of tree branches along the DNA "tree trunk"?

A) Depending on where the transcription begins on the DNA template, different lengths of transcripts get generated.
B) Each position on the DNA dictates the specific length of the RNA transcript generated from that particular position.
C) The transcript randomly grows from the DNA without any particular reason.
D) A single DNA can be transcribed many times continuously, and the RNA transcript gets longer as the transcription apparatus moves down the DNA.
E) There is no known reason for the transcription unit to assume the "Christmas-tree-like" shape.