An assembly line is to be designed for a product whose completion requires 21 minutes of work. The factory works 400 minutes per day. Can a production line with five workstations make 100 units per day?

a) Yes, with exactly 100 minutes to spare.

b) No, but four workstations would be sufficient.

c) No, it will fall short even with a perfectly balanced line.

d) Yes, but the line’s efficiency is very low.

e) Cannot be determined from the information given.