Option (c) is the correct answer. The provided text states that all minorities, religious or linguistic, can set up their own educational institutions and that by doing so, they can preserve and develop their own culture. This supports the interpretation that minorities have the right to establish schools for their community's benefit.

Option (a) is incorrect because the text does not state that institutions are exclusive to only minority children. Option (b) is incorrect as the text focuses on the rights of minorities to establish their own institutions, not on duties for government schools. Option (d) is incorrect because the text does not suggest minorities can demand exclusion from all other institutions.