The LCT gene codes for Lactase, which is responsible for the breakdown of lactose. Which of the following statements could explain how Lactase activity is increased in the presence of lactose?

a) Lactose blocks RNA polymerase from binding the promoter sequence, facilitating transcription of the LCT gene.
b) Lactose prevents binding of transcription factors at the transcription start site of the LCT gene.
c) The presence of lactose causes nucleosomes to separate, exposing the LCT gene.
d) The presence of lactose causes nucleosomes to pack together tightly, exposing the LCT gene.