Social loafing refers to the phenomenon where individuals exert less effort when working in a group compared to when they are working alone. In the context of the school assembly, while some children are actively participating by singing, others may contribute less (e.g., moving their legs or not singing at all) due to the presence of a group, leading them to feel less individually accountable.
Social Facilitation (1) involves improved performance on tasks when in the presence of others, which does not explain why some children are not participating. In this case, the presence of others is not enhancing performance but rather reducing effort.
Social Inhibition (3) refers to the tendency to perform worse on tasks when others are present, but this does not fully capture the scenario where some children are simply not participating. Social inhibition generally refers to a decrease in performance due to nervousness or anxiety, which isn't directly related to the lack of participation.
Social Motivation (4) pertains to the influences of social factors on motivation but does not specifically address the disparity in participation observed. It is a broader concept and does not focus on the specific lack of effort in a group setting.
The correct concept in this case is social loafing, as it explains why some children are contributing less in a group setting like the school assembly.