A firm has the following characteristics: Relatively small in size Marginal revenue is equal to the selling price Economic profits will not be earned for any significant period of time The firm is best described as existing in a(n):

A．<TABLE border=0 cellSpacing=0 cellPadding=0 width="90%"> <TBODY> <TR> <TD vAlign=top>A. purely competitive market. </TD></TR></TBODY></TABLE>
B．<TABLE border=0 cellSpacing=0 cellPadding=0 width="90%"> <TBODY> <TR> <TD vAlign=top>B. price searcher market. </TD></TR></TBODY></TABLE>
C．<TABLE border=0 cellSpacing=0 cellPadding=0 width="90%"> <TBODY> <TR> <TD vAlign=top>C. monopolistic market structure.</TD></TR></TBODY></TABLE>