Write the next sentence in the following story.

How to get rid of smelly gas
Contain your gas until you can pass it discreetly.
Everyone produces gas, and some days your gas may be smelly. If you're gassy on a given day, try holding your gas in during moments where it may be embarrassing to pass gas.

Choose from:
a). Pass gas when you're severely ill. Maybe you've gotten it the night before at the last possible moment, or been diagnosed with a history of breathing in smelly gas.;
b). These could include when you're gassy on the date, or getting late for a work exam. Sit in a changing room with your hot dog, or write a note for yourself saying, " smelling my dog.;
c). You can wait for a discreet moment, such as when you're alone in your office, to pass gas. However, do not hold in gas to the point you experience pain.;
d). This trick works for many reasons including : Gas may cause a stuffy nose. People take longer to fart, resulting in fewer laughs.;. The answer should be
c).