The text provided is incomplete and does not contain any specific errors to correct. However, I can suggest a continuation for the sentence to complete the thought:
"When both lactose and glucose are available to E. coli, which part of the lac operon regulation assures that glucose will be metabolized first? A) The repressor binds to the operator in the absence of lactose, preventing the transcription of genes necessary for lactose metabolism until glucose levels are depleted."
This addition provides a context for the question and aligns with the biological mechanism of the lac operon, which prioritizes glucose metabolism over lactose when both are present.