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

Which of the following definitions best describes 'frowning'?

A. A facial expression behaviour which appears very neutral (showing no expression).
B. A facial expression behaviour in which the jaw drops.
C. A facial expression behaviour in which the eyes are closed.
D. A facial expression behaviour in which the person frowns.

Answer: A facial expression behaviour in which the person frowns.