The more television children watch, the less competent they are in mathematical knowledge. More than a third of children in the United States watch television for more than five hours a day; in South Korea the figure is only 7 percent. But whereas less than 15 percent of children in the United States understand advanced measurement and geometric concepts, 40 percent of South Korean children are competent in these areas. Ttherefore, if United States children are to do well in mathematics, they must watch less television. Which one of the following is an assumption upon which the argument depends? ["A child's ability in advanced measurement and geometry increases if he or she watches less than one hour of television a day.", 'South Korean children are more disciplined about doing schoolwork than are children in the United States.', 'Children in the United States are less interested in advanced measurement and geometric concepts than are South Korean children.', 'The instruction in advanced measurement and geometric concepts available to children in the United States is not substantially worse than that available to South Korean children.']