Concept:A presidential system places the authority to execute laws in the hands of a separately elected president.
Explanation:In presidentialism, the executive and legislative branches are elected independently.
The president, as the head of the executive branch, is ultimately responsible for enforcing and implementing laws.
This is unlike parliamentarianism, where the executive is drawn from and accountable to the legislature.
While dictatorship and autocracy concentrate power in one ruler, they do not necessarily describe a legal system where the leader is given the ultimate executive responsibility.
Thus, the system that empowers the leader with ultimate responsibility to execute laws is presidentialism.
Answer:B. presidentialism