Aaron, bob, and charlotte are running a race. which event would be considered dependent? determining the chance that bob comes in first or third determining whose coach runs the stopwatch determining which person begins on the inside lane determining first, second, and third place runners

Two events are described as dependent if the outcomes/ occurrence of the first effects the outcome of the second so that the probability is changed. From the choices given, dependent event will be:
determining first, second and third place runners.

This is because, it will require the assumptions that previous races maybe considered to come up with the probabilities.