A Major Difference Between Eukaryotic and Prokaryotic RNA Polymerases Is $\sigma$

Multiple Choice

A major difference between eukaryotic and prokaryotic RNA polymerases is that eukaryotic polymerases

A) use a set of transcription factors to bind to and initiate transcription.
B) use sigma ( $\sigma$ ) factors to initiate transcription.
C) start from promoters.
D) start from origins of replication.