In Prokaryotes,the _____ Factor Recognizes Base Sequences in the _____ $\sigma$

Multiple Choice

In prokaryotes,the _____ factor recognizes base sequences in the _____ which facilitates RNA polymerase binding and initiates RNA synthesis.

A) " $\sigma$ ;promoter"
B) "regulatory;enhancer"
C) " $\sigma$ ;enhancer"
D) "regulatory;promoter"
E) "omega;promoter"