B Is your answers to the question
The answer is Extraversion;Introversion.
Extrovert tend to be more likely engage in social interractions which improve the probability of having close emotional relationship with other people.
Introverts on the other hand, are tend to avoid social interraction which reduce their probability to have a meaningful relationship and increase the probability of depression.
Formal. it's a casual event so no need to go on strict dress codes and a lunch is not a party.
