The marketplace being a competitive battlefield is primarily due to A. the efforts of industry incumbents to lower cost products/services at a faster rate than their rivals. B. the constant rivalry of firms to strengthen buyer patronage among competing sellers of a product or service, in order to win a competitive edge over rivals. C. the ongoing race among rivals to achieve the fastest rate of growth in revenues and profits. D. the ability of industry rivals to build strong defenses against the industry's driving forces. E. the ongoing efforts of industry members to introduce innovative products/services as fast followers into the marketplace.