I believe the correct answer is Investigative interest.
Explanation:
John Holland is a psychologist who propounded a theory that classified thinkers and their various career interests. According to him, investigative interest involves an individual who is a rational thinker with a huge interest in research work and theory. Such an individual is always inquisitive and open to finding and understanding new theories. In my opinion, having an investigative interest make you think logically, you analyse issues and try to solve them. Examples of careers that involve investigative interests are Writers, Aerospace Engineer, Pharmacist, electrical engineer, etc.
Given the above, Austin's intention to one day become an engineer to solve issues in the world of science indicates an investigative interest.
