Which one of the following acts is an example of body language?
a. acting on an attitude
b. rolling of the eyes
c. employing the peripheral route of persuasion
d. showing prejudice

Body language is based on transmitting information by the movement of the body, rather than by language or other means.

The example of body language here is rolling of the eyes(option B): it means that something is silly or boring.

The other options refer to verbal communication or commucation in general.

Jet streams are relatively narrow bands of strong wind in the upper levels of the atmosphere. the winds blow from west to east in jet streams but the flow often shifts to the north and south. jet streams follow the boundaries between hot and cold air. the earth's rotation is responsible for the jet stream as well.