A) The use of planning and operational variances will enable TP's management to draw a distinction between variances caused by factors extraneous to the business and planning errors (planning variances) and variances caused by factors that are within the control of management (operational variances). and C) If planning and operational variances are not distinguished, there is potential for dysfunctional behavior especially where the manager has been operating efficiently and performance is being judged by factors outside the manager's control. In the case of TP it became evident during the period that the prevailing market prices for materials were significantly less than those set during the budget process. and E) Standards that failed to anticipate known market trends when they were set will reflect faulty standard setting.

B) The purchasing manager's performance can't be compared with the adjusted standards that reflect the conditions the manager actually operated under during the reporting period.

D) Where a revision of standards is required due to environmental changes that were not foreseeable at the time the budget was prepared, the planning variances are controllable.