Which of the following best describes one of the main motivations behind Franklin D. Roosevelt's court-packing scheme?

a. To increase the number of Supreme Court justices to ensure a more diverse representation of legal expertise.
b. To reduce the workload of the existing Supreme Court justices by appointing additional judges.
c. To stack the Supreme Court with sympathetic judges who would support his New Deal policies.
d. To establish a system of term limits for Supreme Court justices to ensure a more frequent turnover of positions.