The AraC Regulatory Protein Turns on Transcription in the Presence

The AraC regulatory protein turns on transcription in the presence of arabinose in which way?

A) With the addition of arabinose, AraC no longer dimerizes and will form a large loop by binding to araO and aria, and thus can interact with RNA polymerase to permit transcription.
B) The dimer will form a large loop by binding to araO and aria, and thus can interact with RNA polymerase to permit transcription.
C) With the addition, AraC no longer dimerizes and thus can interact with RNA polymerase to permit transcription.
D) It becomes less flexible, so that a monomer can bind to araI₁ and araI₂ and interact with RNA polymerase to permit transcription.
E) It becomes more flexible, so that the dimer can bind to araI₁ and araI₂ and interact with RNA polymerase to permit transcription.