DrEwell,a Developmental Psychologist,is Planning on Conducting a Study That Involves

Dr.Ewell,a developmental psychologist,is planning on conducting a study that involves watching children play together to determine how sharing behavior occurs in same-sex friend pairs compared to opposite-sex friend pairs.

-Why would most psychologists have no problem with the ethics of Dr.Ewell's study?

A) His research topic is interesting.
B) People in a public park do not expect their behavior to be private.
C) Research with children is generally not risky.
D) Observing children is the only way to collect data about this topic.