Answer:
c. cost leadership; differentiation
Explanation:
Remember, we are told that the owner wants to make her runners affordable to the public, and we agree that affordability is only possible when there is cost leadership. Cost leadership strategy simply implies that the company's products/services are positioned to be the cheapest in comparison with other competitors.
To specifically focus on quality and uniqueness, the sharks were asking the owner to pursue the differentiation strategy. Differentiation strategy requires having features that set your product or service apart from others such as quality and uniqueness.