Why did people protest during the $1968$ Democratic National Convention?

A$.$

Protestors were trying to rally support for the Republican, Richard Nixon.

B$.$

Southern Democrats protested the fact that Humphreys was chosen over the pro$-$segregationist Wallace.

C$.$

The selection of LBJ$\text{'}$s Vice President, Hubert Humphreys, was seen as a continuation of LBJ$\text{'}$s pro$-$Vietnam administration.

D$.$

The protestors were Civil RIghts activists, angry that the Democrats were not doing enough to continue the Civil Rights legislation.