An Engineer from Volkswagen's European Headquarters Spent Three and a Half

An engineer from Volkswagen's European headquarters spent three and a half hours on a Greyhound bus to experience the vast distances North Americans travel in their automobiles and to try to understand why North Americans treat their automobiles as rolling extensions of their living rooms.
-Refer to Volkswagen.What kind of data did the engineer collect?

A) heuristic
B) primary
C) cohesive
D) secondary