What Makes the Marketplace a Competitive Battlefield

What makes the marketplace a competitive battlefield?

A) the race of industry members to build strong defenses against the industry's driving forces
B) the constant rivalry of firms to strengthen their standing with buyers and win a competitive edge over rivals
C) the ongoing race among rival sellers to have the highest-quality product
D) the ongoing efforts of industry members to introduce new and improved products/services at a faster rate than their rivals
E) the ongoing race among rivals to achieve the fastest rate of growth in revenues and profits