Why Is Entitlement Spending Difficult to Control

Why is entitlement spending difficult to control?

A) Entitlement spending is at the discretion of the President who does not need Congressional approval to disburse funds to means-tested programs.
B) The amount spent is determined by the amount employers contribute to their employees' retirement accounts.
C) The amount spent is disbursed by each government department individually.
D) The amount spent is determined simply by the number eligible for benefits, unless the underlying law is rewritten.
E) The amount spent is subject to voter approval.