The correct answer is: "the legislative branch".
The principle of division of powers states that the power of a state has to be divided in three branches:
- Legislative branch: in charge of enacting laws and regulations. In the US this function is performed by the Congress.
- Executive branch: in charge of the law enforcement mechanisms. This power is exercised by the Goverment.
- Judiciary branch: is in charge of interpreting the laws, in order to solve related controversies. This fucntion is performed by the court system.