The correct answer is disgust.
Disgust is the opposite of trust in Robert Plutchik's wheel of emotions.
Psychologist Robert Plutchik developed a theory of emotions exemplified in a wheel called "wheel of emotions."
This author considered that there are eight elemental emotions. These are disgust, anger, anticipation, sadness, surprise, fear, trust, and joy. And in the wheel of emotions he developed, he tries to demonstrate the counterparts and relationships between these emotions. Attached you will find the picture of this wheel of emotions and how each emotion has its counterpart. Plutchik also .created 10 postulates about the evolution of emotions.
So yes, disgust is the opposite of trust, joy is the opposite of sadness, anticipation is the opposite of surprise, and fear is the opposite of anger.
