In one massive experiment, potentially delinquent boys were assigned to a 5-year treatment program that included professional counseling and family assistance. many years later, joan mccord's investigation of this program's effectiveness revealed that a clients who received the special treatment subsequently had fewer incidents of juvenile delinquency. b clients typically underestimated the truly positive effects of this program on their own lives. c only the therapists who were involved in the program could accurately gauge its effectiveness. d clients' accounts of the program's effectiveness were often misleading and overly positive.

D. clients' accounts of the program's effectiveness were often misleading and overly positive.

Explanation:

In the experiment, she observe that the ex-delinquent overly praise the program as something that give them some sort of guidance that they never knew before.

It's very unusual because the guidance that given in the program is actually very common to be taught by the parents of non-delinquent over dinner. This indicates that parents lack of involvement and communication play a really big part in the formation of delinquents and they can be easily preventable as long as the parents are willing to pay attention to their children.

the correct answer is ) possibility.

demonstrating opportunity cost is done through production possibility.

the opportunity cost can be demonstrated using the production possibility frontier or curve. this graphic shows the total number of possibilities for two products when we have the resources needed and used in an efficient manner. the main resources could be money, labor, and technology. the curve shows that the production of one good increases when the production of the othe