The most accurate result of the Sand Creek Massacre among the options provided is: B. Many Americans feared Indians more because they saw that Indians were willing to kill large numbers of settlers.
The Sand Creek Massacre in 1864, where a U.S. military force attacked a peaceful Cheyenne and Arapaho encampment in Colorado, resulted in the death of many Native Americans, including women and children. The brutal nature of the massacre heightened tensions and fear among American settlers, leading to increased hostilities between Native Americans and settlers. While some individuals may have begun to question the treatment of Native Americans, the overwhelming public sentiment at the time leaned toward fear and support for military action against Native populations.
Options A and D do reflect some responses to the event, but broadly speaking, the immediate aftermath was one of increased hostility and fear among settlers. Option C is not accurate, as the massacre actually resulted in loss of life and land for the Native Americans involved.