The correct option is A Paul Hersey and Ken Blanchard
The Situational Leadership Theory was developed by Paul Hersey and Ken Blanchard. Situational leadership can be referred to a situation when the leader or manager of an organization must adjust his style to fit the development level of the followers he is trying to influence. In situational leadership theory, the style of the leader may change continually to meet the needs of others in the organization based on the situation.