What was the primary reason for the formation of the National Union of Boot and Shoe Rivetters and Finishers (NUBSRF) in 1873?

A. To negotiate higher wages for all boot and shoe workers
B. Due to dissatisfaction with their low status within the Amalgamated Society of Boot and Shoe Makers
C. To improve working conditions for riveters and finishers
D. To unite boot and shoe makers across the UK
Answer: 