Answer:
first c, then a and b.
Step-by-step explanation:
All of the events happened in 1968.
The Tet offensive shattered public confidence in Lyndon Johnson's administration on January, 30th.
Lyndon Johnson announced that he would not seek reelection after almost losing the New Hampshire primary on March, 31 st.
Martin Luther King Jr. was killed in Memphis while supporting a garbage workers' strike on April, 4th.
The Tet offensive shattered public confidence in Lyndon Johnson's administration.