Which of the following growth media would you expect to result in synthesis of high levels of mRNA for the enzymes of the E. coli lac operon?

A.	high glucose, high lactose.
B.	no glucose, no lactose.
C.	high glucose, low lactose.
D.	no glucose, high lactose. Under high lactose and low glucose conditions, high levels of the mRNA for the lac operon are synthesized.
E.	none of these.