Answer:
The correct option is;

Explanation:
From the diagram, we have that the segment
is given as the measured distance between the points A and B while the measured segment
is constructed on the line m, starting from a point C and using a compass whose width is adjusted to the length of the segment
and with the metal tip of the compass placed at C, to draw an arc the crossed the line m at a point which is then marked and labelled as then point D
Therefore the length of the segment
is equal to the length of the segment
and the relation is expressed as
.