In the GDR, migrants lived mainly from …

EDITORIAL LEARNING AID

Why is this answer correct?

In the GDR there were mainly contract workers from Vietnam, Poland and Mozambique, recruited for industry; Cuban and Angolan workers also came. France and Romania (b), Chile and Zimbabwe (c) as well as North Korea, Mexico and Egypt (d) played no comparable role.

GDR contract workers came from Vietnam, Poland and Mozambique.

This translation and explanation are editorial learning aids. The official German wording and answer key govern the examination.