Which strategic approach tends to work best when price competition among rival sellers is vigorous, the market is large, and there are few ways to achieve product differentiation?

Answer: A low-cost provider strategy

Explanation:

The low-cost provider strategy is a marketing strategy where the marketer makes his product the lowest priced in a very competitive market while still being able to make profit.

The low-cost provider strategy would be the best sales strategy in a price competitive market, as it would draw most buyers to the seller.