What are the reasons behind the change in political system from Kathmandu valley .

For a long part during the medieval period, there has been a feudal system in Nepal.

Explanation:

The royal members of the family sued to fight for the dynasty. However, after 2008, the kingdom was officially abolished but there was still no political instability in Nepal. Oli, who belonged to the communist party, was removed just after 9 months of the government.  

The main reason behind the political instability is that everyone wanted power and parties piled up against a person who is in government.

what is the other part to the question

answer; i believe the answer is (b) fascism;