Answer:
The correct answer is: a) neuroticism
Step-by-step explanation:
The Big Five Personality Traits include: openness (to experience), conscientiousness, extroversion, agreeableness and neuroticism.
The last one - neuroticism - is related to emotional stability/instability and refers to the experience of negative emotions such as depression, anger or anxiety and is associated to low tolerance to stress. Those who score high in this personality trait are usually emotionally reactive and negative emotions are persistent in their daily moods.
Sudie's description refers to an unemotional, even-tempered person, which represents the opposite to the trait of neuroticism.