Final answer:
Rivalry in the soft drink industry within Porter's Five Forces model is best represented by Coke and Pepsi bidding for an exclusive sales contract at a football stadium. This direct competition for market share between the two companies showcases the high degree of rivalry characteristic of the industry. Option D is correct.
Step-by-step explanation:
Within Porter's Five Forces model, rivalry among existing competitors deals with the degree to which companies within the same industry strive for market share and profitability. The example representing rivalry in the soft drink industry is: D. Coke and Pepsi submit bids to the owner of a football stadium for the exclusive sale of their products during games.
This scenario is a direct competition between the two giants of the soft drink industry competing for the same business opportunity, which is a clear illustration of high rivalry. It demonstrates how both Coca-Cola and Pepsi are vying to secure an exclusive contract, something that can significantly affect their market presence and sales.
In contrast, option A reflects minimum order requirements which relate to supplier power, option B represents buyer power with Walmart's negotiation tactics, and option C is about a new entrant's direct selling strategy, possibly reflecting threat of new entrants or channels of distribution.