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What is the BEST explanation for Bahrain's population age structure?
CIA Worldbook Facts. "File:Bahrain Population Pyramid 2012.jpg." File:Bahrain Population Pyramid 2012.jpg. Wikimedia Commons, 23 Feb. 2013. Web. 25 Feb. 2016. <https://commons.wikimedia.org/wiki/File:Bahrain_population_pyramid_2012.jpg.
Bahrain has a high female mortality rate.
Bahrain has a lack of prenatal care causing a high maternal death rate during birth.
Bahrain has a high immigration rate of male workers.
Bahrain has reached an exponential growth rate.
Bahrain has a male dominated workforce.