Which of the following options allow you to connect the last in a continuous series of lines back to the starting of the series?

Method 1:

Open CAD window, start typing the command for "Line". When you start typing "Li" itself the list of predefined options will get populated.

Either you can select from the list of options that it here we have to use Line command and then press "Enter" or simply type "Line" command and type "Enter".

It will ask the user to provide the coordinates that is where to start and where to end.

Method 2:

Goto AutoCAD, type 'C' and then press "Enter". Now a line segment would have been created as per the guidelines given in the question.