In the balance theory, a system (composed of observer, person, and object) is referred to as a .

TRIAD

Explanation: The balance theory proposed by Fritz Heider is a theory that explains that the behaviours of an individual are not stable because of the communication and behaviour of other people.

A triad is basically a grouping of three. In the balance theory, a system (composed of observer, person, and object) this grouping of three is referred to as a TRIAD.

d. the polar jet stream   lies between the polar easterlies and trade winds should be your answer

answer; an active listener;