This kind of person in business terminology is called a free rider.
A firm achieves differentiation parity ideally when it sells its products or services at a higher price than its competitors.
The idea of parity is that a company sells its products at a higher cost than competitors even though the product or service isn't unique. Differentiation is when one companies products compete and are better than another with the same product.
Option D. The size of the market
This is because they have an idea that with a larger market size the can gain economies of scale and make a larger profit.