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B. The president can establish a direct connection with people.
It has been reported in a research by Roy Baumeister and Julie Exline that self-control temporarily weakens after exertion, replenishes with rest, and becomes stronger with exercise.
Self-control is an ability to subdue impulses or to regulations one's emotions, thoughts, and actions in order to fulfill specific (longer-term) goals, especially when faced with temptations and impulses. This enables a person to plan, evaluate alternative actions instead of getting carried away by impulses, and prevents him/her from behaving in a way that he/she might regret later on. Willpower is the ability to exert self-control.
The civil service system is much better than the alternative, which was Patronage. as implemented by the Hoover Commission. Civil service sets employment competence standards for hiring and makes working a permanent career, not just until the next election. it was so outstandingly successful, that virtually every state and community government follows it to large extent.