Answer: An opportunity niche
Step-by-step explanation:
According to the given question, James open a small mobile repairing shop near the university and he is satisfied in an opportunity niche area.
As, the niche marketing is one of the opportunity that helps us providing the various types of products and the business services in the market. It is one of the target-able portion in the market as it focuses on the actual requirement of the customers.
It also provide various types of benefits such as establishing large business, reducing the level of competition and reducing the competition in the market.
Therefore, An opportunity niche is the correct answer.