Promoters for Heat Shock Proteins in E $\sigma$ Subunit Is Present $\sigma$

Promoters for heat shock proteins in E. coli differ from the general consensus sequence. What is the effect of this difference?

A) These genes are never transcribed at high levels.
B) These genes are always transcribed at high levels.
C) These genes are only expressed in high amounts when an appropriate $\sigma$ subunit is present.
D) These genes recognize multiple different $\sigma$ subunits.
E) These genes are always transcribed at high levels, and they also recognize multiple different $\sigma$ subunits.