An elementary school teacher believes that boys are better at math than girls. Therefore, he tends to answer questions for boys while dismissing girls who ask questions. Subsequently boys in his class received higher test scores than girls, which reinforce the belief that boys are better at math than girls. This is an example of:

self-fulfilling prophecy        

Explanation:

Self-fulfilling prophecy: In psychology, the term "self-fulfilling prophecy" is described as one of the different "socio-psychological phenomenon"  in which an individual is ought to expect or predict about something and therefore this expectation or prediction comes out to be true just because he or she believes it that it will happen and therefore his or her resulting behavior would fulfill the given beliefs.

In the question above, the given statement represents the self-fulfilling prophecy.

answer; i believe that the correct answer is (decreased)

new communications technology has affected the way social movements are organized because nowadays, social movements rely on social networks and the media to get different people with a similar way of thinking in contact, and thus, get them to mobilize for a greater cause.

individuals only participate in collective action when they feel identified with it. is in this aspect that social media becomes relevant, because it guarantees communication among all individuals and organizes the social actions that are going to be carried out, i.e., the social movements.

in addition, being covered by the media is important to validate the message and make it relevant in the social agenda, as well as to reach more people who can share interests, appealing to public sympathy for their cause.

in conclusion, it is by social networks and social media that social movement is given birth; by connecting different individuals with similar ideas and organizing them to mobilize for a greater cause.