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.
I think kids are joining gangs because their friends are in an make them think its cool so basically their following their friends footseps like the Marlboro man that guys smoked and made people think if you smoke a cigarette it'll make you cool and stuff even though people died others kept doing it a lot still smoke cigarettes.
