On the basis of figures it compiles, a citizens' group argues that congressional members of Party X authorize the spending of more taxpayer dollers than do congressional members of Party Y. The group's figures are based on an analysis of the number of spending bills for which members of Congress vote. The figure of the citizens' group will be unreliable as a gauge of which party in Congress spends more taxpayer dollars if which of the following is true?
A) The group weighs all votes for spending bills equally, no matter how much taxpayer money is involved in each bill.
D) Most spending bills that members of Party X vote for are written and sponsored by members of Party Y.