Answer: c. cultural norms for manners have changed over time.
Step-by-step explanation:
The dynamic social impact emphasis over four parameters:
1. Clustering of people belonging to different social groups.
2. Correlation
3. Consolidation
4. Continuing diversity
The dynamic social impact theory suggests that cultures can be created or changed on the basis of regular communication between neighbors, coworkers, and friends. Thus the norms of the society as well as practicing culture change with time.