Indicate if the following represents independent events. Explain briefly. Measurements of the heart rates of all students in the gym

A. Independent, because the outcome of one trial doesn't influence or change the outcome of another.
B. Not independent, because the outcome of one trial doesn't influence or change the outcome of another.
C. Not independent, because the outcome of one trial does influence or change the outcome of another.
D. Independent, because the outcome of one trial does influence or change the outcome of another.