Final answer:
Rob is likely high in the Big Five personality trait of neuroticism due to his tendency to be anxious and worried, a characteristic associated with emotional instability and negative emotions.
Step-by-step explanation:
Rob tends to be very anxious and worried about everything, especially himself. He is likely high in the Big Five personality trait of neuroticism. This trait is indicative of a tendency to experience negative emotions such as anxiety and is associated with emotional instability. People high in neuroticism often feel anxious and unhappy and may have an increased risk for various health problems. In contrast, those scoring low on neuroticism are more likely to be calm and even-tempered. The Five Factor Model of personality traits, commonly known by the mnemonic OCEAN, includes neuroticism as one of the five major factors defining human personality.