On the basis of figures it compiles, a cit

问题：

On the basis of figures it compiles, a citizens’ group argues that congressional members of Party X authorize the spending of more taxpayer dollars 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 figures 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.

B．The group counts votes for all spending bills, including bills concerning the salaries of members of Congress.

C．Most spending bills that are introduced in Congress are passed by Congress.

D．Most spending bills that members of Party X vote for are written and sponsored by members of Party X.

E．(E) All spending bills, before being voted on by Congress, must be approved by committees in which members of both parties participate.