Aaron, a premed student, received an A on his anatomy and physiology exam. He told his roommate that though he had studied for the exam, and it was mostly just good luck that the professor had asked so many questions that he understood. Because Aaron attributes his success to luck rather than his own hard work, Aaron appears to have .

An external locus of control

Explanation: Individuals with external locus of control are simply those who believe or are of the opinion that external factors Plays a huge role in the outcome of their endeavor and as such success or failure hinges more on external constraint beyond their control rather than their own personal ability. This is evident in Aaron's comment after had succeeded in his Anatomy and physiology exams obtaining A after having studied hard. However, he still believed that luck, an external factor played an important role in his success. Other external factors may include bias, circumstance and so on.