(A) Inevitably, these discussions focus on present-day dilemmas.

(B) But the issues themselves are not new and have historical roots that go much deeper than have been acknowledged.

(C)In the early years of the twenty-first century, the impact of immigrants on the welfare state has become a staple of discussion among policymakers and politicians.

(D)It is also a recurrent theme in the press, from the highbrow pages of Prospect to the populism of the Daily Mail.