△KLM is reflected to form​​ ​ △K′L′M′ ​.The vertices of​ ​​ △KLM ​ are​ K (2,4) ​, L (1,2) ​, and M (4,1) ​. The vertices of ​​ △K′L′M′ ​ ​are K′ (4,2), L′ (2,1), and M′ (1,4).Which reflection results in the transformation of △KLM ​ ​ ​to​​ ​ △K′L′M′ ​​​?A.reflection across the x-axisB.reflection across the y-axisC.reflection across y = xD.reflection across y=−x