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

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

A．Bears and bulls
B．The domestication of bears
C．Phrases and animals
D．Bullfighting