Answer:
Letter A is correct. Fostering competition.
Explanation:
In this case, it is correct to say that small businesses are fostering competition.
Competition in the business world can be defined as a situation where two or more companies that supply products are rivals in the quest to conquer the same market and the same customers.
Large companies often have some dominance and influence over the market, which means that they impose various barriers to market entry by other competing companies, especially if they are micro-companies. In the case of the above question, when there are a large number of small companies looking to establish themselves in a specific niche in the market, due to possible retaliation by large companies, together, they are exerting an influence on the market that promotes competition.