Marketing decision makers in a firm must constantly monitor competitors' activities-their products, prices, distribution, and promotional efforts-because

• A. The competitors may be violating the law and can be reported to the authorities
• B. The actions of competitors may threaten the monopoly position of the firm in its industry
• C. The actions of competitors may create an oligopoly within an industry
• D. New product offerings by a competitor with the resulting competitive variations may require adjustments to one or more components of the firm's marketing mix