Historians sometimes rely on video recordings in reasearching past events because

Most video recordings are considered primary sources. Primary sources are classified as any historical artifact, document, etc. that was created during the time period in question- by a person who actually experienced an event. So, if a researcher wanted to find out about World War II, video recordings of planes and footage of the destruction of war is crucial.

Explanation:

answer; (d) i believe that the correct answer is americans finally ran out of ammunition;