The government can stop a public protest of its policies if .
the protest is unpopular
the protest is on public property
the demonstrators endanger public safety
the demonstrators face counterdemonstrators

The government can stop a public protest of its policies if the demonstrators endanger public safety.

Option: C

Explanation:

If public are unsatisfied with the performance of Government in any perspective than they can make a group and agitate against them. Its their right to say their demands before government. But it should be in peaceful way so it can not hamper other's interest or property.

If a public protest is disturbing others and destroying public safety then it would be restricted at any cost. For that government can take serious steps to prevent the agitation.

the conditions that made the byzantine empire vulnerable to attacks by the muslin turks were the sack of constantinople by western crusaders, the conquests of the sultanate of rum, presence of rival kingdoms and finally the set up of fiefdoms at the empire which were owned by the ghazis (turkish warriors).

d) iowa i believe is the answer