Answer: I would contend that the right answer is FURTHERMORE.
Explanation: Just to elaborate a little on the answer, it can be added that the adverb "furthermore" is used to add more information and also to introduce or stress the importance of an idea. It can also be replaced with the phrases "in addition" or "more importantly." The first sentence indicates that people (in a company, perhaps) agree that the council cannot move forward unless tough choices about the budget are made. AND, IN ADDITION, no one is willing to do the effort necessary to get that job done. Therefore, they are facing two challenges or difficulties. "Furthermore" is the word that would most logically connect the sentences.