This question asks about the meaning of the expression positive reinforcement. To answer this question, you should look at the part of the passage following the expression positive reinorcement. The expression such as indicates that examples of positive reinforcement are going to follow. Your job is to look at the examples of positive reinforcement and draw a conclusion about what positive reinforcement might be. Since praise food, or money might be given in
return for a job well done, then positive reinforcement must be a reward. You should click on the second answer to this question Next look at a click-on example from the computertest where a structural clue to the meaning of the tested word is included in the passage.