Arrow's Impossibility Theorem set out conditions that a satisfactory system for determining group preferences should exist. Which of the following is not one of these conditions:

Select one:

a. there is no dictator in the group

b. the method must produce a transitive group preference order

c. if every member of the group prefers one option to another, then so must the group

d. the group's preferences between two options depends on members' preferences for other options