Which scenario could occur without the supremacy clause?

a the federal government could intervene if a state passed a law denying a group of equal rights
b the judicial branch could not review a federal law changing the way congress operates
c a state could ignore the nineteenth amendment and pass a law forbidding women to vote
d a state would have no say in how to conduct trade with other states

Excerpt from w. e. b. du bois jon reese 4 du bois was one of the first male civil rights leaders to recognize the problems of gender discrimination. he was among the first men to understand the unique problems of black women, and to value their contributions. he supported the women's suffrage movement and strove to integrate this mostly white struggle. he encouraged many black female writers, artists, poets, and novelists, featuring their works in his crisis magazine and sometimes providing personal financial assistance to them. the cause was that w.e.b. du bois encouraged many black female writers, artists, poets, and novelists. what was the result? think about cause-and-effect relationships.