Concept:Identify the number that does not follow the common property of the others. Here, the property is being a perfect square.Explanation:Check each number for being a perfect square. 38, 39, and 40 are not perfect squares because no integer multiplied by itself equals them. 36 is a perfect square because 62=36. All other numbers share the property of not being perfect squares, making 36 the odd one out. The official answer key confirms this logic.Answer:Option D (36)