These north american countries attract a large number of immigrants due their high standards of living.

canada
greenland
mexico
u. s.

"Canada" and "U. S." are the two North American countries among the following choices given in the question that attract a large number of immigrants due their high standards of living. The correct options among all the options that are given in the question are the first and the fourth options.

Assuming this is a question on a test just name a restaurant by your house and the state you live in, its not too difficult : )

Answer (d) the greenhouse effect is primarily caused by car and trucks;