When adam​ smith's ten pin workers​ specialized, they were able to increase the output of pins in a day from 200 to​ 48,000. one reason for the increase in pin production was due to
a. the bonus they received when they produced more pins.
b. the mastery each worker achieved over his assigned task.
c. the threats the supervisor made to fire them if they did not increase output.
d. the boredom the workers suffered when they stopped making a whole pin and only concentrated on one task such as straightening the wire?