Sean, a psychologist, watches a group of teenagers listen to a rock band and decides to conduct a research on the effects of music videos on children and adolescents. in this case, the initial source of idea for the research is:

The initial source of idea for the research is called the world around. It means that the individual are likely to get the source of idea from the environment or external factors that is used for the individual to have an idea of what he or she is going to use for the research that he or she is going to conduct.

  b.

there are isolated pockets of farming, generally around rivers and oases, which are used for irrigation.