Step 1: Differentiate between growth and development. Economic growth often refers to a quantitative measure, like an "increase in size" (e.g., an increase in GDP). Development, however, is a broader, qualitative concept.
Step 2: Define development. Development encompasses improvements in the quality of life and living standards, such as better education, healthcare, infrastructure, and political freedom. A "simple change" could be negative, and "constancy" implies stagnation.
Step 3: Select the best description. Therefore, a "positive change in quality" is the most accurate and best indicator of true development.