Why did nixon order us forces to bomb north vietnam in 1972? to intimidate its leadersto end the tet offensiveto cut off supplies for the viet congto retaliate for the my lai massacre?

The correct answer of the given question above would be the third option. Nixon ordered the US forces to bomb North Vietnam in 1972 to cut off supplies for the Vietcong. In addition, his goal was also to slow down the progress of the invasion from the North. Hope this answer helps.