The correct answer is neuroticism.
According to McCrae & Costa's theory of the 5 factor model of personality, humans possess five primary trait dimensions that they are either high or low on. These five traits are called "ocean" personality dimensions since "ocean" is an abbreviation for the five traits:
1. O- Openness
2. C- Conscientiousness
3. E- Extraversion
4. A- Agreeableness
5. N -Neuroticism
Neuroticism refers to how moody, emotionally stable, even tempered and psychologically resilient a person is. Therefore, "I remain calm in pressure situations" corresponds to the neuroticism personality dimension from the ocean personality model.