What Underlying Assumption Leads to the Policy That Judicial Salaries

What underlying assumption leads to the policy that judicial salaries are set by an independent commission?

A) that politicians do not specialize in salaries
B) that legislators will limit the salaries of the people who complicate their job
C) that judges may act out of self-interest and make decisions that are favourable to the people writing their paychecks
D) that judges will use political leverage to get higher salaries