Because of the separation of powers in the United States government, the Legislative branch may enact laws, the Executive branch may veto laws, and the Judicial branch may

C) decide that a law is unconstitutional.

its one of the jobs of the branch

The Judicial branch may annul the laws of the state that are not compatible with a higher norm. Its responsability is to apply the law in the name of the state and to ensure equal justice under law.

The government is divided in independent and separate branches to provide a balance and avoid only one power dictating decisions.

The Legislative makes the laws.

The Executive enforces the law.