Sally found that neither caffeine nor extraversion individually predicted problem solving; however, she found that they both worked together to predict problem solving. This is an example of what kind of an effect?
A) a true interaction
B) a suppressor
C) an evocation
D) a true mediation

A) a true interaction

Explanation: Problem solving includes using generic methods in an orderly manner to find solutions to problems. Some of the problem-solving techniques developed and used in philosophy, artificial intelligence, computer science, engineering, mathematics, or medicine are related to mental problem-solving techniques studied in psychology. To solve a problem one need to have an insight about the problem. Know what the problem is and then decide in the best approach to solve the problem.

answer; foreign services officers;

i believe the answer is: description

description refers to the goal of psychologist to identify the phenomenon that being observed. this goal is being actualized by collecting data/information from various clues that observed through the phenomenon. this goal must be accomplished before pyschologist able to create methods of treatment.