I believe it’s D
When a physician is in a hurry, it may be hard to get to certain patients, and have a certain amount of time to work with them.
I’m not completely positive with this answer, but it seems somewhat accurate.
It will be Josh who gets his target THR. His range is within 135 bpm—175 bpm while the actual heart rate was 165 bpm, deducting it with 20 bpm results to 145 bpm - falling to the 135 bpm—175 bpm THR range. Although doing the same method as Josh's results to 165 bpm for Dominique, it doesn't fall to his 150 bpm—183 bpm THR range.