Darley and berscheid (1967) gave university women ambiguous information about two other women. asked how much they liked these people, the participants reported feeling more attracted to the person whom they

I believe the answer is: expected they would eventually meet

In the studies, they found that women tend to show stronger preference with someone that they could emotionally connect with
This study is carried out in 1967, when options for long-term communication was extremely limited, so they tend to show stronger preference for the people they expected to meet the most.

683 Notical Miles from my approximation.