Answer: The correct answer is : D) the US X-Mas bbing campaign
Explanation: The Christmas bombing occurred in 1972 by the United States and was the most devastating offensive of the entire war, lasted 12 days for 24 hours a day. They destroyed wharves, bridges, railroads, transmitters, radio transmitters, oil deposits, hospitals, streets, houses, factories and the population of North Vietnam was greatly diminished.
