Which is true of the Korean War? Helicopters were used to drop Agent Orange on the forests

North Korea flew over 1 million combat missions

It is the first war using arial combar

North Korea attacked the United States

That would be #1 from what I have read.

Explanation:

The text I read said: "Agent Orange was a powerful herbicide used by U.S. military forces during the Vietnam War to eliminate forest cover and crops for North Vietnamese and Viet Cong troops."

C) North Korea attacked the United States

Explanation:

can you post options?

option d is correct. corroborated sources of historical evidence   is necessary to validate a claim about an event in history.

historians tend to use written sources, but audio and visual materials as well as artifacts are important objects that supply information to modern historians.

historical sources are usually divided into two categories: primary and secondary sources. depending on the historian's intent, some sources shift their designation. determining what type of sources toimplement, and the level of credibility and reliability of those sources, is a significant step in critical thinking for the historian.

explanation: