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Explanation: Diaspora refers to the dispersal of human beings forced by either oppressive circumstances in their land of birth or conscious migrations for better economic conditions. The key word is "dispersal" for which the Malay equivalents are pemencaran, penghamburan, penyelerakan, penyebaran and penyuraian.
My choice of the first equivalent in the given list is because the chosen word carries the sense of "to separate" or "to be separated" i.e. the presence of choice/options. For me, the other equivalents suit the situation of life being propagated through the dispersal of seeds etc. If the situation is where there is 'full' choice on thepart of the migrant "Penghijrahan" would be a better choice.