I believe the answer is: Replication
During a replication, Researchers would repeat the research that conducted in the past, but being done with different situations or different type of subjects. The purpose of such research is to determine if the finding on the previous research would be applicable under different circumstances.
The answer is b. Hope this helps
They must serve on juries
This has often been referred to as communication predicament.
It means that there are certain stereotypes younger people have towards older generations, such as that they are always and invariably dependent on them and that they should basically be treated as someone incompetent. In turn, these older generations start acting according to these stereotypes, which leads to their abilities declining.