Nam's grandfather has always been very good at mechanical problems and math. he also used to be very shy in social situations, but now that he is older, he is much more talkative and engaging. this reflects: a. stability versus change. b. nature versus nurture. c. continuity versus stages. d. change versus nurture.

The correct answer is A. Stability versus change

Explanation:

The term Stability versus Changes refers to two different theoretical perspectives about the way personality traits are developed and change over time and whether these are consistent. In the case of Stability, this theory proposes the personality traits some develops at an early age or during childhood will remain unchanged for the rest of its life. On the other hand, the change theory proposes the interaction traits can change during life as a result of different experiences. Considering this, the statement "Nam's grandfather has always been very good at mechanical problems and math" represents the Stability theoretical perspective as the same personality traits are consistent during all the life of this individual, while the statement "He also used to be very shy in social situations, but now that he is older, he is much more talkative and engaging" represents the Change theoretical perspective as some his traits changed during time. Thus, the situation presented represents the Stability vs. Change theoretical perspective.

i would say b. research typically uses a variety of sources