Final answer:
Bogdan Khmielnitsky is controversial due to his role in the 1648 rebellion which led to an alliance with Russia and included massacres of non-combatants, affecting historical interpretations and relations between several groups even today.
Step-by-step explanation:
The question Why is Bogdan Khmielnitsky controversial today? relates to his role in historical events, specifically his actions during the 1648 rebellion against Polish rule in Ukraine, which he led as a Cossack Hetman. Bogdan Khmielnitsky is controversial due to his role in the 1648 rebellion which led to an alliance with Russia and included massacres of non-combatants, affecting historical interpretations and relations between several groups even today. The choice b. joined Ukraine to Russia, also murdered innocent non-combatants best represents the primary reason for his controversial status, as his rebellion involved a military alliance with Russia and resulted in massacres, particularly of Polish and Jewish communities, which are considered by many historians to have been large-scale atrocities. Khmelnytsky's actions and their consequences have lasting implications and are subject to various interpretations, affecting Ukrainian-Russian-Polish-Jewish relations today.