According to machiavelli what will happen to a leader when things go wrong and he is in need of support

People will turn against him.

Explanation:

One of the core perceptions of Machiavelli's theory is that the leader must be feared in the first place. There is where resides his power, on the fear. Once the leader finds himself alone and without any support of his agents and political referrers, then the people will turn against him because the fear no longer exists.

what is the question you are trying to ask?

a would be the answer