Answer:
Showed that FDR's conservative opponents could effectively block his proposals
Explanation:
This is the option that best explains why the Judiciary Reorganization Bill of 1937 (also "Court-Packing Bill) is notable in FDR's New Deal. This bill was a legislative initiative that was proposed by the President in order to add more justices to the Supreme Court. This would effectively allow FDR to have more control over the rulings of the Supreme Court. This bill is notorious because it showed that FDR's opponents would do anything to effectively block his proposals.