Answer:
C. Useful for writing a report to the shareholders
Step-by-step explanation:
Based on the scenario being explained in the question, it safe to say that cost behavior is not among the major reasons" useful for writing a report to the shareholders.
Cost behavior can be define as an indicator that shows how a cost will change totally when there is a change in some activity. We have three types of cost behavior that are usually discussed in managerial accounting and cost accounting these are;
1.Variable costs
2. Fixed costs
3. Mixed or Semivariablecosts.
All the other option shows a major reason why a manager understands cost behavior except useful for writing a report to the shareholders which is option C.