The most accurate response regarding the impact of Roosevelt's 'Court Packing' plan would be:
Roosevelt would have had more justices to rule in favor of what he wanted.
This option reflects the primary objective of Roosevelt's plan, which was to increase the number of justices he could appoint, thus potentially swaying decisions in favor of his New Deal legislation. It also highlights how this would have altered the judicial landscape to align more closely with his political agenda.
The other statements can be considered in context but focus more on the implications of the balance of power rather than the direct impact of the plan itself.