Answer:
The correct answer is the option A: Mass media.
Step-by-step explanation:
To begin with, nowadays the mass media has increased in the world in a huge and dramatically number. It is possible now, for everyone to start a production of content that will be in the social medias and will affect definitily to everyone involved in the content and furthermore, the youth is now more conected than ever and the use of those medias are more common and easy for them so they see each other very affected by the use of it and all of the content that is in those medias. That is why that the largerest single influence on the movement toward uniformity in the global youth market is mass media.