Influences on Group Decision-Making in Moral Dilemmas

Consider a study where groups of participants are given a moral dilemma involving whether to allocate limited resources among several individuals in distress. The groups are varied by size, composition of members (homogeneous vs. heterogeneous), and prior relationships among group members. Understanding the dynamics at play, which of the following factors is most likely to significantly impact the decision-making process of the group concerning resource allocation?