In a decision on the Affordable Care Act,the Supreme Court ruled that

A) state governments could decline to expand Medicaid coverage without losing their existing Medicaid funds from the federal government.
B) the federal government could take away a state's Medicaid funds if it refused to expand Medicaid coverage.
C) the federal government had no constitutional authority to spend its tax revenue on health care programs like Medicaid.
D) state governments could not refuse to expand Medicaid coverage because of the supremacy clause of the Constitution.