Individuals with a longer dopamine-4 receptor gene are generally more likely to be:

The association between a longer dopamine-4 receptor gene (known as DRD4) and thrill-seeking behavior has been well-documented in psychological research. This gene affects the dopamine neurotransmitter system, which plays a significant role in the brain's reward pathways and motivation. Individuals with this genetic variation tend to exhibit behaviors associated with seeking novelty and stimulation, often characterized by an inclination toward risk-taking and adventurous activities.

Thrill-seeking behavior might include engaging in extreme sports, exploring new experiences, or a general preference for high-stimulation environments. This trait stems from the brain's response to dopamine release, which can drive individuals to seek out new and exciting challenges.

On the other hand, the other choices focus on different personality or social traits that are not directly correlated with the distinct genetic predisposition associated with the DRD4 gene. While those with a longer allele may exhibit certain traits, the explicit link to thrill-seeking is the strongest and most supported by existing literature. Therefore, the correct alignment of the longer DRD4 receptor gene variant is with thrill-seeking behavior, reinforcing its association with increased exploratory behavior and risk engagement.