What is the difference between immigration and settler colonialism

Immigrants can enrich a nation. But there is a difference between immigrants and colonists. The former are eager to learn the ways of their adopted home, to integrate and perhaps assimilate — which does not require relinquishing their heritage or forgetting their roots. Colonists, by contrast, bring their culture with them and live under their own laws. Their loyalties lie elsewhere.

Your answer is b , public works