The correct answer is letter A
Explanation: The discovery Christopher Columbus was important because it led to the colonization of the Americas. He thought he had arrived in India, that was his object. But when he arrived there he met natives who were very obedient and docile.
Nebuchadnezzar attacked the city of Jerusalem and raided the treasures of the island. Thus, the answer is letter D. This event is most commonly referred to as the siege of Jerusalem which happened on July 10, 586 BC. With this incident, it was said that individuals were forced to witness the execution of their family members.
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All of these organizations sought to protect organized labor after the industrialization of America had led to dangerous working conditions for many workers. They were mostly succesfull, in at least bringing attention to these issues.