The correct answer is B. Add a morning walk to her routine several days a week.
Step-by-step explanation:
Walking as any physical activity contributes to your health and make you more physically active if included as part of the routine. In the case of Shannon, walking several days a week as part of her routine is the best option, not only because this would help her to achieve her goals, but also because it adapts to her needs, and preferences considering Shannon does not have to spend a lot of money to include walking as part of her routine as it occurs with buying a treadmill, and also she does not need to exercise with other people as in the case of joining a health group or a sport team.