Answer:2. the norm of reciprocity.
Explanation:The norm of reciprocity which is also called the rule of reciprocity , is a norm in our society which occurs when we return the good that has been done for us. It goes like this when someone has done some act of kindness for you , you will also feel bound to do the same for them. This is used mostly by Marketers , they give you sales , special promotions and coupons in order to draw you closer.
Another example is when the neighbor welcomes you and bring some basket of fruits or cakes next time they ask you a favour you will feel obligated to do it for them.
Most of immigrants came from Europe because the economic condidtions on the contitent, transition from agriculture to industry, famine, overpopulation and so on. When the US closed the west frontier, immigrants were looking for new territories and they decided to go north. Yukon gold rush in Canada, new railways all contributed to the increase of immigration to Canada and northern territories.
B, false. That's just straight up integration
