In a Competitive Market,the Actions of Any Single Buyer or Seller

In a competitive market,the actions of any single buyer or seller will

A) have a negligible impact on the market price.
B) have little effect on overall production but will ultimately change final product price.
C) cause a noticeable change in overall production and a change in final product price.
D) adversely affect the profitability of more than one firm in the market.