The correct answer is c) calling Congress.
The executive branch, headed by the President, has several tools to check the powers of the legislative branch, which is primarily Congress. One of the key ways the executive can influence legislative action is by calling Congress into special sessions to address important issues or to push for specific legislation. This power enables the President to directly engage with Congress and advocate for certain policies or actions.
Option a, changing the jurisdiction of federal courts, is not within the direct control of the executive branch, as it involves judicial powers. Option b, refusing to implement judicial branch decisions, refers more to a potential conflict between the executive and judicial branches rather than a direct check on the legislative branch. Thus, calling Congress represents a clear check the executive has over the legislative process.