Answer:
The correct answer is C. the Vietnam war
Step-by-step explanation:
C is correct answer since during his presidency war in Vietnam escalated. Man casualties, led to the protests against the war, especially among the student population.
A is not a correct as his Great society legislation was one of the most successful programs, in which he dealt with poverty.
B is not a correct answer as president Kennedy was killed before Johnson took the office. He is actually the one who directly succeeded him.
D is not correct, as this is a scandal connected with president Nixon, after he resigned the office