Describe living and working conditions for immigrant workers, as you understand them from the text. what do you think was the worst part of their experience?

An immigrant is someone who decides to live in a foreign land. The lives of the immigrants are somehow more difficult than the original settlers of the land because there might be biases in the law when it comes to who gets to work in a certain company, government, etc. The worst part of their experience could be being not so accepted in the foreign land due to some existing laws, etc. 

Your answer is d)magnesium