Final answer:
GPS tracking can reveal the duration and intensity of activities by measuring distance, speed, and time, which are related to a user's movements. It does not provide insights into abstract personal attributes such as emotional state or cognitive abilities.
Step-by-step explanation:
GPS tracking can reveal several attributes of activities related to movement and location. The correct answer to the question 'What attributes of activities can GPS tracking reveal?' is a) Duration and intensity. GPS devices use the principles of physics to calculate the distance traveled, the time it takes to cover that distance, and the speed which can be directly related to the intensity of the activity. It can provide information like the total distance traveled, the departure time of a journey, or the continuous temperature of a device moving along with a vehicle. Moreover, you might use this information to graph the position versus time which can be essential for understanding movement patterns.
However, GPS tracking devices cannot determine an individual's emotional state, motivation, future planning, goal setting, cognitive abilities, or mental state as these are abstract concepts that are not directly measurable by geographical data. Factors like emotional factors and physical performance would require different methods of assessment that go beyond the capabilities of GPS technology.