Which of the Following Statements About Campaign Spending in House

Which of the following statements about campaign spending in House elections is true?

A) The amount of money spent by challengers and incumbents has decreased at the same rate since 1980.
B) The amount of money spent by incumbents has decreased since 1980 and has decreased at a much faster rate than the amount spent by challengers.
C) The amount of money spent by incumbents has increased since 1980 but has grown at a much slower rate than the amount spent by challengers.
D) The amount of money spent by incumbents has increased since 1980 and has grown at a much faster rate than the amount spent by challengers.
E) The amount of money spent by incumbents has increased since 1980 and has grown at the same rate as the amount spent by challengers.