The supply curve illustrates that firms:

A、increasethequantitysuppliedofagoodwhenitspricerises.;
B、decreasethequantitysuppliedtoearnhigherprofits.;
C、increasethesupplyofagoodwhenitspricerises.;
D、decreasethequantitysuppliedofagoodwheninputpricesfall.