Procter & Gamble added bleach to its Tide laundry detergent, but people didn't believe it was different because it looked the same. So$,$ P&G added blue beads to the normally white detergent. Though the blue beads had nothing to do with the bleaching action, consumers could "see" the difference. In this case, consumers were organizing stimuli into a meaningful picture. What is this process called?

a$)$ exposure

b$)$ retention

c$)$ perception

d$)$ cognition