Answer:
Option A:
Each buyer and seller is small, relative to the whole market; no single decision maker has any influence over the market price.
Step-by-step explanation:
A competitive market is a market that is characterized by free entry and exit. This means that any party has a right to enter the industry, do business, and leave it freely. In other words, no party or business holds enough stake to become a gatekeeper in that industry.
Furthermore, prices are determined by the forces of demand and supply, and cannot be arbitrarily set by any business.
No single decision maker has any influence over the market price.
This makes option A correct.