Answer:
a. similarity of values
Step-by-step explanation:
There are series of factors that leads to the determination of the relationship between individuals which on the long run shows the mutual feeing of likeness among each other.
In the case of the matching of the first year students for Welcome Week dance by Hatfield and her coleagues at University of Minnesota, the values similarity among the students determined they like each other. Eample, someone who valued an easy going and reserved person would definitely chose a date sharing similar values with her for the said dance compared to another who is extremely extroverted and talkative.