McClelland's Cross-Cultural Research (Reported in His Book The Achieving Society)

McClelland's cross-cultural research (reported in his book The Achieving Society) led him to conclude that

A) a preoccupation with achievement arises from a country's prior economic growth
B) the average level of achievement motivation among a country's populace is an accurate predictor of the country's future economic growth
C) a country's future economic growth is directly dependent on the religious ideology of those in power
D) none of these