mAnuFACturErs FounD out thAt Color AFFECts sAlEs ______.
A．By ExpEriEnCE ovEr A long pErioD oF timE
B．By ExpErimEnting with DiFFErEnt Colors
C．By trying out Color on BlinD pEoplE
D．By DEvEloping thE DisCiplinE oF Color psyChology