Roosevelt's Plan Involving the Supreme Court in 1937 Became Unnecessary

Roosevelt's plan involving the Supreme Court in 1937 became unnecessary when

A) the Supreme Court ruled that only the president has authority to adjust the number of justices.
B) the Supreme Court agreed to an extension of the number of justices under certain cases.
C) Congress removed cases involving the New Deal from the Supreme Court's jurisdiction.
D) the Supreme Court began reversing previous judgments and upholding the New Deal.
E) he began using executive orders to circumvent the Supreme Court.