According to tile passage, we know that "bulls, bears, and bubbles" has a history of about ______.

A．chicken farmers can order certain strains of chicken for economic reasons
B．origen can hardly supply all the strains of chicken the market might need
C．chicken farmers can order certain strains of chicken only
D．origen can be supplied with whatever strain they need

A．historical study of phrases using bull as an image
B．bears and bulls are not friends of humans
C．bulls are powerful animals and people associate them with certain feelings
D．bears and bulls used to be worshipped by primitive people