What area of software development focuses on the user's reaction to and interaction with the software product?

A) Technical feasibility
B) User experience
C) System documentation
D) Quality assurance

User experience (UX) is the area of software development that focuses on the user's reaction to and interaction with the software product. This includes aspects such as ease of use, visual design, and overall satisfaction with the product. Technical feasibility, system documentation, and quality assurance are important areas in software development, but they do not specifically address the user's interaction with the product.