The discipline a social scientist is trained in plays a role in the questions he or she asks. "How do educational opportunities for women impact national infant mortality rates in Eastern European countries?" would most likely be asked by a(n).

A SOCIOLOGIST

Explanation: A Sociologist can be defined as an individual whose activities make use of the scientific method to answer questions regarding the study of society, human social interaction and the rules and processes that bind and separate people not only as individuals, but as members of associations, groups and institutions.

They are also known as social scientists.

answer; adoption agencies tend to place separated twins in similar homes;

answer; because they must appeal to a broad cross-section of the population;