Which of the following groups, aside from Jews, suffered casualties during the Holocaust?

The correct answer highlights that Gypsies (Romani people), homosexuals, disabled individuals, and others were also targeted and suffered significant casualties during the Holocaust. The Nazi regime implemented a systematic campaign of persecution and extermination against various groups that they deemed "undesirable," in addition to the Jewish population.

The Romani people faced mass killings; estimates suggest that hundreds of thousands were murdered. Homosexuals were often arrested and sent to concentration camps where many also died under harsh conditions. The disabled were subjected to a program called T4, which involved the euthanasia of those deemed "unfit." This broadens the understanding of the Holocaust beyond just the Jewish experience, illustrating it as a tragic event that affected multiple marginalized groups.

The other choices focus narrowly on specific groups or imply exclusivity, failing to acknowledge the fuller scope of Nazi persecution. For instance, while political dissidents, Soviet prisoners of war, and Jehovah's Witnesses were certainly victims, they do not encapsulate the wide range of individuals targeted during this horrific period. Hence, option B is the most comprehensive and accurate response, reflecting the multi-faceted nature of Nazi atrocities.