Please help me its a timed test!

How did the atomic bomb end the war

How does the supremacy clause of the u. s. constitution affect the states? o a. it requires each state to establish a supreme court. b. it declares that the federal government can take away state powers if necessary. o c. it allows state governments to overthrow the federal government if necessary. o d. it ensures that the u. s. constitution overrules each state constitution

Brainliesttt !me : ) describe the responses to terrorism in the united states.