Answer the following question: Read the article and select the best answer. Article: Shopping is not as simple as you think! There are all sorts of tricks at play each time we reach out for that particular brand of product on the shelf. Coloring, for example, varies according to what the producers are trying to sell. Health foods are packages in greens, yellows or browns because we think of these as healthy colors. Ice cream packets are often blue and expensive foods, like chocolates, are gold and silver. When some kind of pain killer was brought out recently, researchers found that _ because they made the product look weak and ineffective. Eventually, it came on the market in a dark blue and white package because we think of it as safe, and white as calm. The size of a product can attract a shopper. But quite often a bottle doesn't contain as much as it appears to. It is believed that the better-known companies spend, on average, 70 percent of the total cost of the product itself on packaging. The most successful producers know that it's not enough to have a good product. The founder of Pears soap, who for 25 years has used pretty little girls to promote their goods, came to the conclusion: "Any fool can make soap, but it takes a genius to sell it." Question: Which of the following may trick a shopper into buying a product according to the text? Options: A: The cost of its package. B: The price of the product. C: The color of its package. D: The brand name of the product.
Answer:
C