Which psychologist is most directly concerned with suggesting ways to improve worker productivity in a computer factory? clinical psychologist personality psychologist industrial-organizational psychologist psychiatrist?

L believe the answer is: industrial-organizational psychologist

industrial-organizational psychologist would utilize the knowledge that he/she learn in psychology filed to improve the quality of workplace environemnt .
Things such as how to improve worker's productivity, how to improve the harmony among team members, and how to create proper chain of commands are usually handled by industrial-organizational psychologist

The answer should be a.