Task: Class Definition Understanding (ontology: Human_Society/EmotionOntology)

Which of the following definitions best describes 'pressing lips together'?

A. A facial expression behaviour in which the lips are tightly pressed together.
B. A facial expression behaviour in which the eyebrows are raised.
C. A facial expression behaviour in which the jaw drops.
D. A facial expression behaviour in which the person smiles.

Answer: A facial expression behaviour in which the lips are tightly pressed together.