Death cap mushrooms produce a substance called -amanitin. α-amanitin efficiently blocks synthesis ...

Death cap mushrooms produce a substance called -amanitin. α-amanitin efficiently blocks synthesis of mRNA, but not of tRNA or rRNA in eukaryotic organisms. How is that possible?
A) α-amanitin efficiently interferes with the action of RNA polymerase I, but not RNA polymerase II or III.
B) α-amanitin efficiently interferes with RNA polymerase III, but not RNA polymerase I and II.
C) α-amanitin efficiently blocks the action of one or more basic transcription factors.
D) α-amanitin efficiently interferes with the action of RNA polymerase II, but not RNA polymerase I or III.