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

How to get high without drugs
Get comfortable.
Before you begin to use this breathing method you will want to make sure you are comfortable, relaxed, and ready to focus. This technique will allow you to increase the oxygen in your body and can produce unusual sensations.

Possible answers: a. Get ready and make sure you won't be distracted before using this technique. This technique is done most easily when sitting or laying down.. b. Your breathing can cause perspiration, excessive sweating, and headaches. You should rest for several hours to help to relax and sleep.. c. Come to a comfortable position and notice your breathing. Notice your heartbeat, which may be higher or lower than it normally is.. d. Be seated on a cushion with your feet flat on the floor, facing a wall. Draw a loop of air into your lungs and blow air out slowly..
a.