What Is an Accurate Generalization from Stouffer's Studies of World

What is an accurate generalization from Stouffer's studies of World War II soldiers?

A) When we serve in a unit with a high promotion rate, we are optimistic.
B) We make judgments about ourselves in isolation, perceiving well-being objectively.
C) Whatever our situation, we form a subjective sense of our well-being by looking at ourselves in relation to specific reference groups.
D) When we serve in units with low promotion rates, our esteem is greater than in high promotion units.
E) When we serve in small units, our chances of promotion are greater.