There was a breakdown in law and order during the Democratic National Convention. Consequently, the third choice is the correct one.
What do you mean by the crisis?
An unstable and dangerous situation that will (or could) affect a specific person, a particular group, or the entire community is referred to as a crisis.
Thousands of Vietnam War protesters clash with police in the streets of Chicago on August 28, 1968, during the Democratic National Convention, as the Democratic Party splits over internal differences on its position in Vietnam.
Hence option 3rd is correct.
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