In the GRE sometime answer, sometimes the choice of answer may not have an exact synonym. We have to look for the proper answer choice which is required by a question. Here biasbias and orientation is aorientation are the correct answeranswers. BiasBias means a decision which favors one party.And orientation, and orientation means an inclination towards something or somebody.
Here Roman archaeological studies give priority towardsto city development over rulerrural developments, and that is why biasbias makes sense. And Roman archaeological studies are inclined towards city development rather than rural development, which makes sense and makes orientationorientation an appropriate answer.
Thanks