Answer:
C) a manufacturer who creates tools such as bolts, latches, door handles etc. for left-handed individuals
Explanation:
A niche market is a segment of a market that has a specific target group of consumers, usually due to a highly specific need or interest of those people. On the contrary, mainstream providers cater to the needs of the mass market, a customer base that is not specific and is largely diverse.
Therefore, large-scale manufacturers that have a large range of standardized products are not considered as niche.
In this example, the company producing miscellaneous things tailored for left-handed individuals is highly niche by nature.