Allolactose induces the synthesis of the enzyme lactase. An E. coli cell is presented for the first time with the sugar lactose (containing allolactose) as a potential food source. Which of the following occurs when the lactose enters the cell?
A. The repressor protein attaches to the regulator.
B. Allolactose binds to the repressor protein.
C. Allolactose binds to the regulator.
D. The repressor protein and allolactose bind to RNA polymerase.
E. RNA polymerase attaches to the regulator