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

The most likely answer to this would be C. Rolling of the eyes.

Body language are thoughts and feelings that manifests through physical behaviour. The body, most of the times unconsciously, tweaks its parts that are consistent with the person's current thoughts and/or feelings, whichever persists or sometimes both. The other three choices presented in this problem are acting upon the the feelings and/or thoughts, and these three might be done verbally where as body language is a non-verbal kind of communication.