Answer:
The correct answer is A, No opportunity cost since he is doing an activity he enjoys.
Step-by-step explanation:
In springs, James like to spend his afternoons in the park. This is his routine and he goes to the park in his spare time to get some enjoyment and relaxation. So he is not leaving anything behind in order to get this relaxing time. Since this is his spare time, there is no opportunity cost involved in his this activity. Rather he is enjoying this time and getting relaxed.