A medical research study tracked the heart rate, in beats per minute, of a participant engaged in various types of exercise. The data are graphed on the set of axes below with the time elapsed during the observation on the $x$-axis and the participant's heart rate on the $y$-axis.

Based on the graph, which statement is true?

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Let's verify each of the answer choices:

The participant's maximum heart rate is reached about 30 minutes after observation begins. ✖

From the graph, the heart rate when 30 minutes have elapsed is not the maximum value of the graph.

The participant's heart rate steadily increases between 25 and 50 minutes during the observation. ✖

It appears that the participant's heart rate actually decreases over the course of the time period.

The participant's maximum heart rate in the first 60 minutes of the observation is about 190 beats per minute.   ✓

As we can see from the graph, the heart rate maximum appears to be around 190.

The participant's resting heart rate is given by the $x$-intercept of the graph. ✖

The $y$-intercept is a better measure of resting heart rate. There is no $x$-intercept present on the graph (the participant would not be alive).