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

How to make your eyes water
Cut some onions.
Onions soak up sulfur from the soil when growing, and when you chop them up, you break open cells in the onion and release enzymes that mix with the sulfur. This creates an invisible gas that causes a burning sensation in your eyes, causing you to tear up without crying.

Select from the following.
[a]. Chop some onions and linger over them. Some people are more sensitive than others; you may only need to cut a little bit of the onion, or you may need to really linger..
[b]. The intestines and the other tissues of the onions combine together to form a gas as well, which dries up your eyes. You can also crush up garlic or sesame seeds to make a paste..
[c]. Think of it as an extra layer of soil over your eye. Working one hand at a time, cut your onions into half a dozen short pieces (roughly 1/8 of the ruler) of equal size..
[d]. Ideally, use a steak knife to cut the onion in half lengthwise. Press the cut half against your eyeball for 15 seconds and then pull it away..
[a].