Answer:
A) Deciding which laws are legal and should be enforced
Step-by-step explanation:
The Executive Branch's main function consists of enforcing all laws made by the Legislative Branch, and even if this branch deems that legislation enacted by Congress is unconstitutional, it is not its duty to determine so, because it is the Judicial Branch the one that is responsible for evaluating laws and the one with the judicial review power to determine the constitutionality of all laws.