In which one of the following instances is the rivalry among competing sellers generally stronger?

When he industry's product entails low inventory storage costs

When there are so many rivals that any one company's actions have little direct impact on the businesses of rivals

When the loyalty of buyers to their preferred brand is high

When buyer switching costs are high and competing sellers seldom make fresh moves to improve their market standing and business performance

When one or more rivals are dissatisfied with their business performance and are making aggressive moves to attract more customers