As the sum of the scores of a student in 5 tests is 120 we get the average score of the five tests as

$$\(\frac{120}{5}=24(=\text { column A quantity })\)$$


Now, as at least two tests scores are less than 20 , the median i.e. the third score can be 20 or more.

For example if we consider the scores as $$1,2,37,40 \& 40$$, we get the median score as 30 which is greater than the average score i.e. 24 . But if we consider the scores as $$18,19,21,22 \& 40$$, we get the median score 21 which is less than the mean score.

Hence a unique comparison cannot be formed between the mean \& the median score, so the answer is (D).