In 1937, President Franklin Delano Roosevelt Asked Congress to Add

In 1937, President Franklin Delano Roosevelt asked Congress to add several new justices to the U.S.Supreme Court.Legislators ultimately rejected the request, after a divided reaction from the public, major lobbying campaigns against the plan, and bipartisan objections.Why might Roosevelt's plan have been controversial?

A) Congress, in setting the number of justices at nine in 1869, had hoped that the number would be final.
B) The plan, although rejected, led one justice to change his views on Roosevelt's proposals to regulate commerce and industry.
C) The president developed the proposal in reaction to the Court's striking down of many of his New Deal proposals, something critics saw as threatening judicial independence.
D) What Congress rejected was a constitutional amendment, something that would have been required to change the number of justices.