Concept:Assessment is purposeful when it helps improve learning and teaching.Explanation:Purposeful assessment provides useful information. It gives feedback to students about their learning. It gives feedback to teachers about their teaching. This feedback helps in making better educational plans. It also checks the effectiveness of the learning process. The other options are not correct. Doing assessment only at year-end limits its use. Comparing students only to rank them does not help improvement. Assessment should not cause fear or stress.Answer:D. it serves as a feedback for the students as well as the teachers