Dorra Corporation manufactures lawnmowers in five work stations. Dorra's weekly demand is 5,000 mowers but Dorra can only produce 4,200. According to the theory of constraints, to increase production output Dorra would benefit the most by concentrating improvement efforts on the:
A. first work station.
B. last work station.
C. largest work station.
D. fastest work station.
E. slowest work station.