Concept:Human development includes physical, cognitive, and psychosocial changes across the lifespan. These changes are both measurable (quantitative) and transformational (qualitative).Explanation:Quantitative changes are those that can be counted or measured, such as increases in height, weight, or vocabulary. Qualitative changes involve improvements in quality, like better reasoning, emotional maturity, or moral understanding. For example, a child grows taller (quantitative) and also learns to think more logically (qualitative). Both types occur together and are necessary for full development. Human development is not limited to only one aspect; it includes both measurable growth and deeper changes in functioning. Therefore, it is best described as both quantitative and qualitative.Answer:D. both quantitative and qualitative