Answer:
Option D; LOOK BACK TO SEE IF THE ORIGINAL PROBLEM HAS BEEN SOLVED.
Step-by-step explanation:
Problem solving is the act of defining a problem; determining the cause of the problem; identifying, prioritizing, and selecting alternatives for a solution; and implementing a solution.
After Marie has identified the problem which is to focus more on her health, she selected a solution which is to start jogging, she implemented the solution, the next step or stage for her as an effective problem-solving strategy is about checking that all the steps were successful and if the problem has been solved (if the solution was effective for the problem).
Therefore, the next step for her as an effective problem-solving strategy would be to LOOK BACK TO SEE IF THE ORIGINAL PROBLEM HAS BEEN SOLVED.