When an inducer or a possible effector molecule binds to the repressor protein, there is a conformational change within the repressor protein causing it to fall of the DNA sequence that it has bounded to.
This allows gene transcription to occur. As the RNA polymerase can access the promoter sequence for instance.
The answer would be B because X values of the table would be increasing by 2 each time. Also the Y values would be increasing by 10 each time. 2 x 5 = 10. 4 x 5 = 20.
