1. What do historians study to learn about the past? O Primary and secondary sources from multiple perspectives and bias.
O Only secondary sources.
O Primary and secondary sources from one person's perspective and bias.
O Only primary sources.

 Primary and secondary sources from multiple perspectives and bias.

Explanation:

the pogroms became known as kristallnacht, the "night of shattered glass," for the shattered glass from the store windows that littered the streets. the morning after the pogroms 30,000 german jewish men were arrested for the "crime" of being jewish and sent to concentration camps, where hundreds of them perished.