Read the text below and answer the question. There's only one correct answer. Text: James owns a small bakery in a residential neighborhood. One day, he decides to install an outdoor seating area for customers. To create the seating area, he places several tables and chairs on the sidewalk directly outside his shop. However, James does not leave enough space for pedestrians to pass comfortably. A neighbor, Sarah, complains that she has to walk into the street to get around the seating area, which is dangerous, especially with heavy traffic. After a few weeks, Sarah trips over one of the chairs that has been pushed out onto the sidewalk and injures her ankle. She decides to take legal action against James. Question: What legal principle is primarily at play in Sarah's case when she decides to sue James for her injury?