This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to make an electroscope
Gather your materials before you begin.
Any kind of plastic drinking straw will work. It just needs to be long enough to go through both holes in the cup.

pick from the following. (i) It doesn't have to be long enough to tie a fishing line snugly around the handle of the cup. Thread the " tip " of the straw through both holes.; (ii) Try to center the straw so that there is an equal length on either side of the cup. Use a sharp pencil to poke 2 holes on opposite sides of a styrofoam cup.; (iii) You will also need : A tobacco stick. A strip of hair or braided hair a ruler or other functional instrument that you can use to record the proportions.; (iv) To make your first image, you'll need two medium-sized straws. Open the larger of the two straws.;
The answer is:
(ii)