Answer: C. Roosevelt was overstepping his authority by trying to pack the Supreme Court
Step-by-step explanation:
During Roosevelt's time, the Supreme Court ruled a number of his New Deal policies to be unconstitutional. Roosevelt responded by trying to "pack the Supreme Court". This meant trying to increase the number of Justices so that he could include Justices that would be more amenable to his policies.
The cartoon is suggesting that by packing the Court, Roosevelt was suppressing its power and a supporter of this cartoon would agree and say that Roosevelt was overstepping his authority in trying to do so as the Judiciary must remain independent.