Final answer:
Madison has high betweenness centrality, indicating she is a key 'bridge' in the social network and controls information flow between other nodes.
Step-by-step explanation:
Madison has high betweenness centrality in a social network because she controls the flow of information to and from many people in the network. Betweenness centrality is a measure in network analysis that indicates the extent to which a node (in this case, a person like Madison) lies on paths between other nodes. This means Madison acts as a 'bridge' or 'broker' in the social network, having significant influence and control over the spread of information because much of it passes through her. The other options, such as besideness, degree, and closeness centrality, do not correctly describe this specific dimensional aspect of Madison's role within the network.