Which of the Following Makes Efficient Implementation of Policy Programs

Which of the following makes efficient implementation of policy programs difficult?

A) Legislative directives are often overly precise and detailed, and thus leave too little room for bureaucratic discretion on how to achieve goals and handle particular cases
B) Responsibility for tasks is too often concentrated in the hands of just one agency in the bureaucracy. This tends to put undue pressure on the agency and undermines accountability
C) Much of what government does is hard to assess. For example, it is difficult to know just how effective a Head Start program is. This, in turn, makes it difficult to assess cost effectiveness
D) All of the above