Database scalability refers to the capability of a database system to handle a growing amount of work, or its potential to be enlarged to accommodate that growth. Option B, the ability to increase resources easily as demand grows, is the correct answer because scalability involves expanding the capacity of the database as the data volume or the number of users increases, without compromising performance.
Reference: CompTIA IT Fundamentals and other foundational IT resources discuss scalability in the context of database management and performance optimization.