Final answer:
Blue-collar, working-class families are more likely to engage in unstructured free play as a free-time scenario, following the 'accomplishment of natural growth' parenting style observed by sociologist Annette Lareau.
Step-by-step explanation:
According to sociologist Annette Lareau's study, as cited by Gladwell, parents from lower-income backgrounds tend to follow an "accomplishment of natural growth" approach with their children, allowing them to develop with considerable independence. This contrasts with higher-income families, who often expose their children to a wide range of structured activities, such as art sessions, science-themed camps, and team sports which are actively supervised. Given this understanding, within a blue-collar, working-class family environment, it is more likely for unstructured free play to be the chosen free-time scenario, as it aligns with the 'accomplishment of natural growth' parenting strategy.