Answer:
a. positive reinforcement
Explanation:
Positive reinforcement: In psychology, the term "positive reinforcement" is described as a phenomenon in which an individual is being provided with something as a reward when he or she tends to perform the desired behavior or action so that he or she can associate that specific behavior or action with the reward that is being provided and then repeat the action or behavior more often and this reward is considered as a "reinforcing stimulus".
In the question above, the given statement illustrates positive reinforcement.
Answer:b
Explanation:
Given
Implicit cost=$ 200,000
Explicit cost=$ 1 million
4000 units
Output=$ 300 per unit
therefore revenue 
as we need to compute accounting profit therefore we do not consider the implicit cost
accounting Profit=1.2-1=$ 0.2 million
and economic Profit =Revenue -explicit cost-Implicit cost
economic Profit=0.2-0.2=0
Thus option b is most appropriate
According to the text, the trend toward more and more of the population entering the 65 and over age bracket is called _____.
c. "graying of america"
