Answer: Theory X
Explanation: Theory X is the motivational theory done by psychologist that determine the people belonging to theory X group usually tend to have low ambition, not interested in taking responsibility and low aspirations . People in this field have intense supervision and low acceptance towards change.
According to the question, Betty has Theory X -related management style as she is not sure about the skills of the hired people. She does believes that hired employees will come to office on time due to the firing policy. This shows her low ambition and responsibility towards her job.