Question

People who take a "layer cake" view of federalism believe that (4 points)
state governments are too weak to meet most citizen needs
state governments are supreme over the national government
national and state governments must cooperate to meet citizen needs
national and state governments are exclusively sovereign in their areas

Answer 1

Generally speaking, people who take a "layer cake" view of federalism believe that "national and state governments must cooperate to meet citizen needs," since they believe that government works in "layers". 

Answer 2

Alright so HistoryGuy's answer is incorrect, I took this test myself. He's talking about Marble cake. The correct answer is D, national and state governments are exclusively sovereign in their areas. This is because each layer has it's own purpose, as does the government.