Which of these helped turn public opinion against US involvement in Vietnam?

Select all that apply.

the North Vietnamese success in the Tet Offensive
the killing of civilians by US troops at My Lai
the victory of Lyndon B. Johnson in the 1968 election
the televising of war footage on national news outlets

Things that helped turn public opinion against US involvement in Vietnam  were

the killing of civilians by US troops at My Lai

the televising of war footage on national news outlets

Explanation:

The war effort of Vietnam was openly televised and covered in great detail by the press and this was for the first time in the history of the country that a war was receiving such a press.

More and more people became disillusioned with the war as they could not identify an immediate cause of why Americans were involved in such a foreign conflict.

This made the people defy the government, the army itself and the whole war effort as something unnecessary and avoidable.