Which One of the Following Statements Regarding Production and Staffing

Which one of the following statements regarding production and staffing plans is BEST?

A) A producer of greeting cards for all occasions can use a level strategy to good advantage because of the complementary nature of the products and the workforce to produce many varieties of cards.
B) The production plan outlines time-phased production rates,workforce levels,and inventories without considering capacity limitations.
C) A decision to vertically integrate is one of the possible demand options a firm may employ when operating under uneven demand conditions.
D) An advantage of employing demand options is that creative pricing and promotional campaigns increase the contribution margin.