Why Is USForeign Policy Discussed in Terms of Presidential Action

Why is U.S.foreign policy discussed in terms of presidential action?

A) Presidents have greater access to and control over information that any other government official or agency.
B) Congress has no power over going to war.
C) President George Washington established the practice during the Revolutionary War.
D) The media adopted the practice to differentiate wars in similar regions.
E) Presidents attempt to claim military invasions as their own to appeal to pro-defense voters.