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D. They made money at the expense of their workers.

Explanation:

The definition of "robber barons" is an individual that has become rich through ruthless and cruel business tactics.

They made money at the expenses of their workers.

Explanation:

the protestant reformation's started in 1517, disturbing the religious and political order in europe´s catholic countries. the outcome was the european wars of religion prosecuted in europe in the 16th, 17th and part of the 18th century. nonetheless, uprisings, territorial disputes, and great power conflicts were also causes of the wars.  

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