In an experiment involving taste, researchers had participants try two versions of a cola, one regular and another, called "cola extra," to which a secret ingredient had been added. The researchers found that, when the tasters did not know that the secret ingredient was white vinegar, they preferred "cola extra" by a margin of almost two to one. However, when tasters were told the identity of the secret ingredient before drinking, they preferred the cola without vinegar 98% of the time. Which of the following, if true, forms the best basis for an explanation of this outcome?a Most consumers are excited by the possibility of tasting a "secret ingredient" and will always prefer that choice. b For most consumers, expectation strongly influences the ability to accurately distinguish flavors. c Most cola drinkers prefer beverages without vinegar, even when they do not know vinegar is present. d Researchers skewed results by telling participants in the second group what the secret ingredient was. e The first group of taste testers was disproportionately composed of people who enjoy the taste of vinegar.