Read the scenario below and answer the question that follows.
revan was excited about working with a group of friends on the next science project. he developed a plan for how the group could most effectively share responsibilities. however, halfway through the project, he realized that no one seemed to be completing their assigned tasks, which led him to complete more than his share of the work. 
based on this information, it is  most likely  that the behaviors of revan’s friends were influenced by  

social loafing 

group polarization 

social facilitation 

groupthink