Answer:
It motivates him to start his research
Explanation:
We can tell the answer is most likely the last option because he says he will "use my gift to do something for them" thus showing he has gained motivation to start his research.
We can further prove this with the statement "I have decided to use my knowledge and skills to work in the field of increasing human intelligence levels" because this is also showing he is going to start his research and not leave the study, try to become smarter, or get his old job.
Have a nice day!
I hope this is what you are looking for, but if not - comment! I will edit and update my answer accordingly.
- Heather