In a group-influence task such as the line judging experiment, what can a single dissenter do to make it more likely that others resist the urge to conform?

Answer: answer against the majority of the group, whether they are correct or not.

Explanation: group influence means a situation whereby two or more individuals who share a set of norms, values, or beliefs. furthermore, a set of individuals who interact with one another and who share some common need or goal and their behaviors are interdependent. There are both positive and negative implications of group influence on individual behavior