When is it necessary for citizens to rebel against their government?

When the leader the citizens chose doesnt keep their promise and when the government try to take away people's natrual right

It  is necessary for citizens to rebel against their government:
When the government is victimization tyranny, that is the unjust use of presidential power.

Explanation:
Citizens ought to have a legitimate right of rebellion against governments who deliberately don't shield their personal security as a result of such governments lose their political and ethical legitimacy in failing to guard the safety of the state. this may be supported by the subsequent ideas. 
Ought to assess whether or not that government voluntarily or involuntarily doesn't shield the safety of its voters (a despotic and corrupt government that fails to guard the security of the individuals mustn't be assessed.

Ithink b is the right answer