The correct answer is "19%".
According to the chart that depicts the state of employment of young adults and teens by industry in July 2014, 19% of this demographic group has jobs related to the retail industry. This information leads the observer to conclude that an important part of this demographic group works in retail activities, as it is common for employers at this industry to employ young workers as the positions involved in this industry don't require as much specialization or training in comparison to other industries.