I think it's the third option. Not entirely sure though.
An evolutionary psychologist would suggest that the function of tradition such as wearing green on saint Patrick day is to enhance the sense of group membership. In addition, the practice, values and goals united by sets of people is raised to as culture and associated with hunter gatherer societies, the agricultural societies are more patriarchal. As societies became larger, humans devised new cultural systems to preserve group cohesion.
The correct option is D.
Twitter is an online news and social networking website, where communication takes place in form of tweets. Tweets can only be 280 characters long.
For those people who are using twitter, a direct message can be used to send a private message to someone about their tweet or other relevant issues. In order to be able to receive direct messages from anyone, one has to has to activate the option of receiving direct messages from anyone.
The answer is air pollution
