The sociologist, daniel chirot, argues that the recent worldwide increase in ethnic hostilities is a consequence of "retribalization." by this he means

Daniel Chirot is a Sociologist and Professor of International Studies at the University of Washington, Seattle.

He argued that the recent worldwide increase in ethnic hostilities is a consequence of retribalization.

His context of retribalization means the tendency for groups to seek meaning and belongin in an ethnic group. There are macro and micro explanations for terrorism.

i would say b. research typically uses a variety of sources