On your birthday, you arrive home and are overjoyed to find a large bouquet of flowers from your best friend. Your eyes grow wide and a broad smile crosses your face. You laugh in delight. This example best illustrates the use of nonverbal behavior to .

Express emotions.

Explanation:

As the exercise describes, the nonverbal communication is the way people communicates without words, be it intentionally or unintentionally. In this case, what is being communicated is an emotion of happiness, of joy, given that the individual got flowers from a best friend in his or her birthday, what gave them joy. This is expressed with the expressions of his face, as it is described "Your eyes grow wide and a broad smile crosses your face". Another example of an emotion being expressed by a nonverbal feature could be anger, with clunched fists, sadness with a crying face, etc.