Which of the following might the President do in the case of violent riots in a major American city?

Explanation:

b- is the only answer thats makes sense.

a curfew would be imposed by the mayor or gov., laws are already in place making rioting illegal, and there is no reason to negotiate a treaty with a state's gov.  

roosevelt essentially took the opposite approach as hoover in taking on the great depression. herbert hoover thought that america and its economy could naturally recover from the depression in due course, so he adamantly restrained the federal government from intervening on behalf of the people affected. on the other hand, roosevelt dramatically increased employment by expanding the federal government and establishing agencies that would aid in relieving some of the country's worst problems.