Answer:
d. progress and material comfort
Explanation:
People strive to become successful and be more outstanding than others.
As for progress, people from US expect that everything should always get better as times passes.
Connected somehow with material comfort in which American society expect to have a high, comfortable and non problematic way of living. Having basic needs like food and shelter, and easy to achieve way of living is something every American (according to sociologist Robin Williams) aims for.
