One of Toyota's Engineers,Ohno Taiichi,found Many Problems with the Company's

One of Toyota's engineers,Ohno Taiichi,found many problems with the company's mass production system.Which of the following is not one of these problems?

A) the system was unable to accommodate consumer preferences for product diversity
B) long production runs created massive inventories that had to be stored in large warehouses which was expensive
C) the system ran too quickly for the employees to keep up which created a high turnover due to frustration and low evaluations
D) if the initial machine settings were wrong, long production runs resulted in the production of a large number of defects
E) small production runs were uneconomical