When did the haymarket protest turn violent? a. when someone threw a bomb at the police b. when someone shouted antigovernment slogans c. when someone attacked bystanders d. when someone attacked a newspaper office

a. when someone threw a bomb at the police

Explanation:

The Haymarket Protest turned violent when someone (who till this day is unknown), threw a bomb at the police killing several of them. The police panicked, shot at the crowd killing both protesters and some of their own officers.

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a. The Haymarket protest turned vigorous when someone bombed a policed.

The Haymarket protests had been instigated by the workers as labour protests for worker's rights. Following the riots and killing of people, a meeting called by labour leaders which included police, strikers and the Mayor of Chicago had been called. While the meeting had been deemed peaceful, things turned from bad to worse.

The attempt to neutralize the crowd after the meeting ended resulted with more riots when a random person threw bomb in the air. Police and civilians were killed and injured in the process.  

the american revolution was by the middle and upper class, and the french was by the lower and middle class.