What is the main indication that the figure below depicts a transcriptional (operon) fusion?

A) A single mRNA is transcribed, from which two proteins are translated.
B) The reporter gene keeps its biological properties: in this case, fluorescence.
C) Transcription proceeds from a single promoter.
D) The target gene maintains its ribosomal binding site.
E) The reporter gene is inserted into the target gene in the proper codon-reading frame.