The Psychometric psychology uses various techniques in the field of testing , measurement assessment and activities related to similar fields.
Psychometric psychology is a sub field of psychology which studies and applies a range of tests which helps in the measurement of knowledge , skills and abilities.
If my friend is interested in math and techniques used to analyze research findings, the sub-field of psychology which suits this is psychometric psychology.
Therefore psychometric psychology best matches the interests of this person and OPTION A is correct.
Learn more about Psychometric psychology here:
brainly.com/question/4656461