Industrial psychology or I-O psychology is regarded as a ... field of...

a.
applied; psychology

b.
research area; psychology

c.
psychology field of HRM

d.
sub-field; HRM

e.
theory; psychology

a. applied; psychology

The correct answer is d. sub-field; HRM.

Industrial-Organizational (I-O) psychology is a sub-field of psychology that focuses on the application of psychological principles and research techniques in organizations. I-O psychologists study various aspects of the workplace, such as employee behavior, employee attitudes, leadership, and organizational development. They also use psychological theories and methods to solve practical problems related to human resource management (HRM), such as employee selection, training, performance management, and organizational change. Therefore, I-O psychology is considered a sub-field of HRM.