Which Statement Is Correct About E.coli Promoters

Multiple Choice

Which statement is correct about E.coli promoters:

A) Most promoters have a high degree of sequence similarity.
B) -10 and -35 regions show the most conservation between promoters.
C) The GC-rich -10 region facilitates the localized unwinding of DNA .
D) Distance between the -10 and -35 regions is moderately conserved from 10 to 30 nucleotides in length
E) None of these statements are correct