Why did Nixon order US forces to mine North Vietnamese harbors in 1972?

to intimidate the Viet Cong

to end the Tet Offensive

to cut off supplies to North Vietnam

to retaliate for the My Lai Massacre

Nixon ordered US forces to mine North Vietnamese harbors in 1972 to cut off supplies to North Vietnam. The correct option among all the options given in the question is the third option. The North Vietnamese army had attacked South Vietnam without any provocation and the steps taken by Nixon was to cut off their supplies from all directions.