Final answer:
Extraversion was strongly linked to middle-aged adults' positive social engagement in contexts such as family life and community activities.
Step-by-step explanation:
The correct answer is Extraversion. In a recent study by Cox & others, it was found that extraversion was strongly linked to middle-aged adults' positive social engagement in contexts such as family life and community activities. Extraverted individuals are typically outgoing, sociable, and easily connect with others, which contributes to their positive social engagement and well-being. This finding aligns with the socioemotional selectivity theory, which suggests that as we get older, our social support and friendships may dwindle in number but become more close and meaningful.