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

How to develop a manly voice
Stand up straight.
When you slouch, your limiting how much you can expand your lungs. If you can breathe in more air, your voice will be stronger, and it's less likely that your voice will crack.

Choices:
(a). Slouching will also increase the chances that you'll start talking faster (i.e. you're about to reach a great point in your speech).;
(b). Keep your shoulders back and keep your chin tucked in. You should be able to comfortably bend at the waist, and your chin will be pointed forward.;
(c). Place your hands on your abdomen and keep your gaze straight ahead. If you feel your eye rolling as you wait, look ahead.;
(d). Breathe from your diaphragm. If you're like many people, you breathe from your chest without much support from your diaphragm.;
The answer is:
(d).