Norman Triplett observed that adolescents wound a fishing reel faster in the presence of someone working simultaneously on the same task. This best illustrates

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The observed phenomenon is social facilitation, in which the presence of others enhances performance on a task. This is consistent with Triplett's finding that adolescents wound a fishing reel faster in the presence of someone else doing the same thing. The other options (mere exposure effect, bystander effect, and group polarization) do not accurately describe Triplett's observation.

Norman Triplett Observed That Adolescents Wound a Fishing Reel Faster