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

How to fart in class without anyone noticing
Don't freak out!
Remember that there is a way to fart and still be savvy.
Clench your anus when you feel your stomach growl.
Even though you may feel immense pressure, it's best to not let the fart come out while your stomach is growling.

Select from the following.
(a). Remember that fart-blowing can give you a headache. Relieve pressure in your intestines by squeezing them harder..
(b). The more pressure you feel, the more deadly and loud the fart will be when it comes out. So make sure your stomach isn't growling before you let one rip..
(c). This will not only send out a fart, but the other students might hear it too! If they notice, they know you're gag chargers. Decide the level of difficulty before the class occurs..
(d). Do this so that other classmates don't check on your usage of the restroom. ( nobody can trace where the bathroom is)..
(b).