Length of line segment CD is 28 units .Therefore Option C is the correct answer.
What is a Polygon ?
A polygon is a two-dimensional geometric figure that has a finite number of sides.
The sides of a polygon are made of straight line segments connected to each other end to end.
In the given figure ABCD
AB = BC
3x+1 = 22
3x = 21
x=7 unit
AD = CD = 4x = 4 * 7 = 28 units
Length of line segment is 28 units .Therefore Option C is the correct answer.
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