Answer:
Option C, Congress
Step-by-step explanation:
The congress is the elected body at national level which has the right and duty to modify old laws and rules and if required frame new ones as well.
General public is the public which votes and elect a congress party. Federal government is the government at state level which has right to frame rules and laws with in its jurisdiction area and President is an apex authority that mainly deals with matter of national importance at the global level such as defense, etc.
Hence, option C is correct.