Final answer:
The intensities of Amber's exercise during the fourth, fifth, and sixth visit could follow the pattern of increasing intensity, decreasing intensity, and constant intensity.
Step-by-step explanation:
The intensities of Amber's exercise during the fourth, fifth, and sixth visit could follow the pattern of increasing intensity, decreasing intensity, and constant intensity. Therefore, the set of values for the intensities during these visits is option c) Increasing, Decreasing, Constant.