The word "rampage" in this context refers to a situation where a group of workers behaved in a violent and uncontrollable manner. They may have caused destruction, chaos, or engaged in aggressive behavior.

Now, let's look at the options provided:.

A. "turned violent" - This option is the closest in meaning to "rampage. " It implies that the workers became violent and aggressive.

B. "robbed" - This option does not accurately capture the meaning of "rampage. " Robbing involves stealing, which is different from the violent behavior associated with a rampage.

C. "were angry" - While anger may be a factor in a rampage, it does not fully capture the violent and uncontrollable nature of the situation.

D. "demonstrated" - This option does not accurately convey the meaning of "rampage. " Demonstrating typically refers to peaceful protests or expressing opinions, which is different from the violent behavior associated with a rampage.

Therefore, the correct answer is A. "turned violent. ".