Answer:
A. Line AB is parallel to, is equal to Line DC
Explanation:
A rhombus is a quadrilateral whose four sides have the same length. It is similar to a square in the sense that it has all its four sides having equal length. It is basically a square which is tilted at an angle. It is also called an equilateral quadrilateral.
Line AB is equivalent to Line DC & both lines are parallel one to another; the same is the relationship between Line BC & Line AD (You can check the attached image for more clarity)
Hence, option A is the answer - Lines AB & DC are parallel & equal to one another