29. Triplett conducted one of social psychology’s first laboratory experiment by asking children to wind string on a fishing reel. The results of the study indicated that the children worked on their fishing reel and when co-actors were competing with them in contrast to when they worked alone.

faster

Explanation:

Norman Triplett in 1898 carried out a research study on social psychology’s first laboratory experiment.

In his research on the speed record, categorizing the child alone and children in pairs but working alone.

Given the children the task to wind in a given amount of fishing line, Triplett observed that many children worked faster in the presence of a partner doing the same task.

Triplett's research experiments demonstrate the co-action effect, a phenomenon which describes how increased in task performance comes as a result of mere presence of others doing the same task.

answer; i do believe its (b) 12.5 years of age;

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