In Thomas and Chess's model of temperament, Joh would be classified as a slow-to-warm-up child.
Who are Slow-to-warm-up people?
These are the class of people who feel very uneasy and cautious when around a new environment or people.
Joh being inactive and negative in mood as a result of low-key reactions to environmental stimuli depicts a slow-to-warm-up child.
Read more about Temperament here https://brainly.com/question/6683393
