Which two kinds of power have been found to be related most strongly to leader effectiveness in motivating subordinates?

These are "expert and referent power".

Referent power in authority is the capacity of a pioneer to develop the regard and deference of his supporters in such ways that they wish to resemble him. In short, referent power is showing others how it’s done. While expert power depends on workers' observation that a chief or some other individual from an association has a high state of learning or a specific arrangement of aptitudes that different representatives or individuals from the association don't have.

the question deals with financial planning and the answer is that dan did not stay on budget due to the fact that this guy needs to start decreasing his discretionary spending. according to the financial plan, he needed to balance his expenses and resources.