In 2004, the Wall Street Journal reported that Starbucks was set to raise some of its prices. The article stated that unlike Starbucks, "mass-market grocery brands such as Kraft Foods Inc.'s Folgers and Maxwell House coffees tend to be much more price-elastic." Which of the following best explains the implications of this quotation?
a. When Starbucks raises prices, it causes sales of Folgers and Maxwell House to rise a lot.
b. When Starbucks raises prices, it causes sales of Folgers and Maxwell House to fall a lot.
c. When the price of Folgers or Maxwell House coffee rises, consumers buy only slightly less.
d. When the price of Folgers or Maxwell House coffee rises, consumers buy a lot less.