What Makes the Marketplace a Competitive Battlefield Is

What makes the marketplace a competitive battlefield is:

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.