A Point Mutation in the Operator of the Lac Operon

A point mutation in the operator of the lac operon would most likely cause

A) no transcription of the lactose metabolizing genes, even when lactose is absent.
B) no transcription of the lactose metabolizing genes, even when lactose is present.
C) no binding of the repressor protein to the operator, even when lactose is absent.
D) binding of the repressor protein to the regulatory gene in both the presence and absence of lactose.
E) no transcription of the regulatory gene, even in the presence of lactose. The repressor binds the operator when lactose is absent. Like a faulty repressor, a mutation in the operator would likely cause the repressor not to bind the operator, regardless of whether lactose is present.