Answer:
B.
Step-by-step explanation:
The 'Court Packing plan' was a plan proposed by President Franklin D. Roosevelt on February 5, 1937. The plan was proposed to expand the number of justices in the Supreme Court to 15. He considered that expanding the number of justices will make justice system more efficient.
But, for critics, the plan was a 'packing' plan because they thought that Roosevelt was trying to neutralize the court to his New Deal plan.
Therefore, they thought that that 'court packing plan' was in conflict with the constitutional principle of checks and balances. Thus option B is correct.