Which statement best describes a government in which there is no separation of powers?

One person rules and has absolute power.

The answer is the second option, "One person rules and has absolute power"

Explanation:

The government usually divides its power into three branches which are the legislative, the judicial and the executive branches. This way, each branch has its own purpose, responsibilities, and power to achieve their goals.

The separation of power is necessary because this way we prevent abuse of power and secure freedom for all, a government where the power is separated is called democracy, different from a government where one person has the absolute power which is called dictatorship.