President Nixon's Policy of Increased Heavy Bombing of North Vietnam

President Nixon's policy of increased heavy bombing of North Vietnam in December 1972

A) caused the People's Republic of China to send a large army to North Vietnam to fight the United States.
B) destroyed all chance of a negotiated peace because Le Duc Tho walked out of the Paris peace talks in protest.
C) caused the North Vietnamese to release their supplies of nerve gas and anthrax.
D) broke the deadlock in the peace talks and got the North Vietnamese to agree to terms.
E) brought Nixon close to defeat in his bid for reelection that year.