Question

those who by valorous ways become princes, like these men, acquire a principality with difficulty, but they keep it with ease. the difficulties they have in acquiring it rise in part from the new rules and methods which they are forced to introduce to establish their government and its security. and it ought to be remembered that there is nothing more difficult to take in hand, more perilous to conduct, or more uncertain in its success, than to take the lead in the introduction of a new order of things, because the innovator has for enemies all those who have done well under the old conditions, and lukewarm defenders in those who may do well under the new. -the prince, niccolò machiavelli which causes in the text explain the central idea that acquiring a principality can be difficult? check all that apply. those who are valorous envy the prince and his new territory. those who did well under the previous leader become enemies. the introduction of new rules and methods is hard for people to take. those who may do well under the new prince are weak defenders. it is dangerous to take the lead in the introduction of a new order.

Explanation:

The text mentions that new rules and methods are hard to introduce (enemies among old - order beneficiaries and lukewarm defenders among new - order beneficiaries), and taking the lead in a new order is dangerous as reasons for the difficulty of acquiring a principality. The envy of the valorous is also stated as a factor.

Answer:

Those who are valorous envy the prince and his new territory.
The introduction of new rules and methods is hard for people to take.
It is dangerous to take the lead in the introduction of a new order.