Refer to ABC Company. Given that ABC is dedicated to operations control, the management must have incorporated all of these aspects of operations control except
a. purchasing.
b. selling.
c. inventory control.
d. scheduling.
e. quality control

Option B Selling

Explanation:

The reason is that the company only control those operations that are completely company's internal matter and largely dependant on internal factors or are present within the organization. The inventory controlling is company's internal matter. Purchasing of anything is company's internal matter. Scheduling meetings or payments are company's internal matters. Likewise having plans and procedures about the quality control and its implementation is company's internal matter. But selling is not an internal matter because external powers play role in the setting the price of the products.

What do you think, can you sell an ordinary soap for $500?

You can't sell that for even $10 in the market. What's the reason you can't sell an ordinary soap at $10? The reason is that competition, options available to customers and many other factors bound you to set a price that the customers are willing to pay. So selling is not internal factor hence  it is not controlable.

answer; is usually (less than) the socially optimal level of consumption;