Which explains how the president’s role as chief legislator has changed over time?
a. the president uses executive orders to support his policy agenda. b. the president uses mass media to support his policy agenda. c. the president uses political advisors to support his policy agenda. d. the president uses political speeches to support his policy agenda.

I believe the answer is: The president uses mass media to support his policy agenda.

the mass support that the president get would make the congress feel pressure to conform to the will of the people. Because of this, legislations with a lot of support from the people would be less likely to be overruled by by the congress during the voting process.

answer; code of federal regulations;