Concept:A monocephalous executive system means a single-headed executive where one person holds all executive powers.
Explanation:In a monocephalous executive system, executive authority is not shared among several individuals.
Instead, all executive powers are concentrated in one person.
This system is typically found in a presidential system of government.
In a presidential system, the President serves as both the head of state and the head of government.
Hence, all executive powers are vested in the President alone.
Answer:The correct option is B. President.