Good Housekeeping magazine places its "Seal of Approval" on all the products advertised in it. If any of the products are later found to be defective, Good Housekeeping promises to refund the money paid for the products. This kind of careful screening .

Is one of the way for a medium to monitoring its advertisement.

Explanation:

 According to the given question, the good housekeeping magazine is one of an organization that always seal its products which is advertised the given products.

This organization also claim that of the products are found defective then the money get refunded based on the cost of the goods.

Based on the given scenario, the carefully screening is one of the process in which we easily monitoring its given advertisement of the firm. The "Seal of Approval" is refers to the impression given by the company for the purpose of monitor the product advertisement.  

 Therefore, The given answer is correct.

previous business sales - c.

answer; /// i believe the answer is (insider trading)