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The α-amanitin is an oligopeptide toxin produced by the mushroom called amanitin. They affect all three RNA polymerases very differently.

Option b is correct because pre-RNA will be most affected if the α-amanitin level decrease as polymerase II is extremely sensitive to α-amanitin.

RNA polymerase I is insensitive to α-amanitin. RNA polymerase II is extremely to α-amanitin and RNA polymerase III is moderately sensitive to α-amanitin.

Option a is incorrect because 18S and 28S rRNAs are not affected by α-amanitin as RNA polymerase I is insensitive to α-amanitin.

Option c is incorrect because 5S rRNAs and tRNAs are not affected by α-amanitin as RNA polymerase III is moderately sensitive to α-amanitin.

Option d is incorrect because 5S rRNAs, tRNAs and small nuclear RNA are not affected by α-amanitin as RNA polymerase III is moderately sensitive to α-amanitin