题目选项分析

One year ago, a major toothpaste manufacturer pulled its sponsorship from quiz programming and transferred it to auto racing. Over the past year, there has been a dramatic reduction in the number of prime time quiz shows on television. Therefore, lower sponsorship must be the cause for the decline in the number of quiz shows.

Which of the following, if true, most seriously undermines the argument above?

【选项】There has been a significant decline in the toothpaste market, forcing the major manufacturer into financial difficulties.