Respuesta :
The US used the chemical Agent Orange to remove crops and heavy vegetation. Option D is correct.
What is Agent Orange?
One of the "tactical use" Rainbow Weedkillers, Agent Orange is a pesticide and defoliant agent.
It is best known for its employment by the United States military as part of Mission Ranch Hand, a weedkillers' warfare operation that ran from 1961 to 1971 during the Vietnam War.
The United States used these techniques to remove crops and heavy vegetation because they wanted to disclose the enemy.
Therefore, option D is correct.
Learn more about Agent Orange, refer to:
https://brainly.com/question/14229732