Final answer:
The statement by the young teenage girl indicating the best progress toward the goal of acceptance of body image is choosing a dress that complements her features, suggesting self-acceptance and a positive view of her own body.
Step-by-step explanation:
The best indicator of progress toward the goal of acceptance of body image in a young teenage girl is statement c. "I'll wear the blue dress. It matches my eyes." This statement implies that the teenager is focused on a positive aspect of her appearance that makes her feel good, reflecting self-acceptance and a positive body image. In contrast, statements a and b show that the individual is still concerning herself with external opinions and perceived flaws, respectively. Statement d shows intent for future confidence but doesn't directly reflect current acceptance of body image.