In an Experiment,subjects Were Asked to Remember a Map and Then

In an experiment,subjects were asked to remember a map and then judge which of two cities was farther north or which of two cities was farther east.Which detail would probably affect the time it takes the subjects to make these judgments?

A) whether the city is on a river
B) whether the subject's location is more north/south versus east/west
C) whether there is a state border between the two cities
D) whether the map is bordered