What is the author's opinion about fitness digital influencers? A) The author believes they have both positive and negative impacts, encouraging healthy habits but also contributing to mental health issues. B) The author considers fitness influencers completely harmful, as they only promote unrealistic body images. C) The author praises fitness influencers for inspiring people to adopt healthier lifestyles without any drawbacks, D) The author argues that social media has no real influence on people's health habits. E) The author does not express any opinion and only presents facts without analysis.