PLEASE HELP, LAST QUESTION! 30 POINTS List the major reasons why the war in Vietnam was an impossible victory?

The raids were the first in what would become a three-year program of sustained bombing targeting sites north of the seventeenth parallel.The troops were the first in what would become a three-year escalation of U.S. military personnel fighting a counterinsurgency below the seventeenth parallel. Together, they Americanized a war the Vietnamese had been fighting for a generation

( This isn’t my answer all credit to taylormccord just wanted to help this person)

So uh think it’s probably d because it has correct punctuation but it might be A bc the letter a is the first letter of the alphabet but it also might be b bc a is not always the correct answer. but it is a 25% chance that c could be the correct answer. your welcome for helping