In the experiments discussed in Chapter 7, social scientists had subjects in a variety of countries play the "Ultimatum" and "Dictator" games. They found

a) The experimental results matched the theoretical predictions of how purely self-interested actors would behave.

b) The experimental results were similar across a wide range of industrialized democracies.

c) The experimental results varied greatly across a range of small-scale societies.

d) The scholars found all of the above to be true.

e) The scholars found only (b) and (c) to be true.