Neil Dropped Out of High School and Worked in a Canning

Neil dropped out of high school and worked in a canning factory until it closed last year. Now he is unable to get another job in manufacturing and may have to take work in the retail sector. According to the text, what economic factor is the primary factor contributing to this decline in the manufacturing job market?

A) an increased need for education
B) unions affecting the job market
C) deindustrialization
D) service-sector growth