Multi-select problem: How does the next paragraph end?

How to dissolve an eggshell
Gather your materials.
For this experiment you will need a fresh, uncooked egg, a drinking glass, a dissolving solution such as white vinegar or a cola beverage, and 4-5 days of patience. The drinking glass needs to be large enough for the egg to touch the bottom without touching the sides of the glass.

Select from:
(a). You can optionally use a plastic bowl instead. Cut the eggshell in half lengthwise.;
(b). Do not use a mixing bowl, or you risk breaking a glass. You will need about 5 egg yolks and one cup of white vinegar.;
(c). You can also use a plastic cup or container to hold the egg, but clear containers allow you to observe the experiment over time. Use a fresh egg because an older egg will float in the liquid.;
(d). To dissolve the eggshell you will need a tool that allows you to trace patterns on the shell. A small flat pan or strainer will work well for melting eggshells.;
(c).