A. From the Project option of the Extend command, enter 50 units, and then select the right end of the line.
B. From the Delta option of the Lengthen command, enter 50! units and then select the right end of the line
C. From the Delta option of the Lengthen command, enter 200 units and then select the right end of the line
D. From the Edge Extension option of the Extend command, enter 50 units, and then select the right end of the line
Explanation:
From the Delta option of the Lengthen command, enter 50 units and then select the right end of the line. This way, you can increase the length of the line by 50 units from its current endpoint without changing its direction or position2
https://www.learnvern.com/autocad-tutorial-in-hindi/how-to-use-lengthen-command