Concept:Separation of powers means that the executive, legislature, and judiciary are independent in both their functions and their membership.
Explanation:In a presidential system, the executive is not drawn from the legislature.
The president is elected separately and does not sit in parliament.
Members of the executive are also not chosen from among the legislators.
Therefore, there is no fusion of powers between these two arms of government.
This is unlike the parliamentary system, which practises a fusion of powers because the prime minister and cabinet are members of the legislature.
In monarchical and feudal systems, power is concentrated in a single ruler rather than shared among separate bodies.
Thus, the strictest practice of separation of powers is found in the presidential system.
Answer:A. presidential system