Personality traits are traits that reflect the person's thoughts feelings and behaviors. All of the choices provided describe different traits a person could have therefore all of the choices are correct
They feel good about themselves.
They do not become overwhelmed by emotions, such as fear, anger, love, jealousy, guilt, or anxiety.
They have lasting and satisfying personal relationships.
They feel comfortable with other people.
They can laugh at themselves and with others.
The answer is C because transportation regulation is going to prevent overcrowding and therefore help with good hygiene. this prevents the spread of germs.