Answer:
c. value proposition based on differentiation and a niche clientele that is willing to pay for added value.
Explanation:
Since in the question it is mentioned that XYZ company provides the premium service also they have various number of competitors that offered the customer at less prices but at the same time this company meet the customer demand having the high quality service so here the value should be proportioned that depend upon on the differentiation also it would be pay for adding the value
Hence, the option c is correct