The most universally understood way of expressing emotion is through

A) hand gestures.
B) body postures.
C) facial expressions.
D) tone of voice.

Facial expressions are considered the most universally understood way of expressing emotion because they can convey a wide range of emotions and are recognized across different cultures and languages. Hand gestures and body postures can also express emotions, but they may have different meanings in different cultures. Tone of voice can also convey emotion, but it may be less universally understood as it can be influenced by language and cultural differences.