What Brought the Senatorial Generals into Conflict with the Senate

What brought the senatorial generals into conflict with the Senate?

A) Julius Caesar demanded a better province of which to be proconsul.
B) Catiline's conspiracy to overthrow the government
C) Sulla's issuance of the proscriptions
D) The Senate's refusal to grant further powers and armies to powerful generals
E) Eliminating the position of Dictator from the Roman constitution