The expression "regardless of" in "regardless of their country of origin" (l.12)...

Questão de Inglês da banca CESPE CEBRASPE aplicada no concurso TJ CE (2014). Confira a resolução completa abaixo:

2014_08_25_53fb274eaeaf5.jpg

The expression "regardless of" in "regardless of their country of origin" (l.12) can be correctly replaced by