According to behavioural scientists,

A) groups have at least five members.
B) group members have a common goal and interact with each other.
C) group members must interact face-to-face.
D) informal groups are shown on organizational charts.
E) members of larger groups tend to report higher levels of satisfaction.

Group members having a common goal and interacting with each other is a fundamental aspect of what defines a group according to behavioral scientists. This interaction does not necessarily have to be face-to-face, and there is no specific number of members that constitutes a group. Informal groups are not typically shown on organizational charts, and larger groups do not always report higher levels of satisfaction.