In a randomized controlled experiment:

A. there is a control group and a treatment group
B. you control for the effect that random numbers are not truly randomly generated
C. you control for random answers
D. the control group receives treatment on even days only

Option A control group and a treatment group.

Explanation: the most important reasons for randomization in an experiment is to eliminate bias by reducing error. A control is usually used to see or show ( baseline) if there is a significant in the treatment. A control group in an experiment is not manipulated or does not receive treatment while treatment group receives the manipulations. That is control in an experiment is not altered but treatment are altered to the aim of the experiment. The treatment group becomes good or better if only it's gives better results than the control group.

economic

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.