Ahistorian is interested in learning about the ancient roman colosseum, an arena where trained fighters battled one another for spectators' entertainment. many gladiators were slaves who were forced to fight to the death with other people and even wild animals. the historian has a difficult time understanding how any person would enjoy, or even tolerate, watching such things! the historian concludes that ancient roman culture must have been significantly more tolerant of violence and slavery than modern american culture. this conclusion is an example of which historical skill?

a. accessing primary sources
b. using contextualization
c. establishing point of view
d. detecting bias