It is given that the quadrilateral is a rhombus . And a rhombus have all sides equal . Therefore , JK = LM
And on substituting the values of JK and LM , we will get
5x = 4x+1
Subtracting 4x from both sides
5x-4x= 4x+1-4x
x =1
So when x=1, JK=LM =5(1)=5
And therefore KL = 5 too . SO the correct option is the second option .