The Main Hypothesis in the Kiesler and Baral Experiment on the Relationship

The main hypothesis in the Kiesler and Baral experiment on the relationship between self-esteem and attractiveness was:

A) the less attractive a subject was, the lower his self-esteem would be.
B) subjects would always prefer attractive partners over less-attractive partners.
C) moderately attractive subjects with low self-esteem would tend to select moderately attractive partners over highly attractive partners.
D) there is no relation between subjects' self-esteem and choosing an attractive partner; what matters is whether the subjects are highly attractive.