What happens next in this paragraph?

How to clicker train a parakeet to target
Get a marker.
Contrary to popular belief, you do not need a clicker to do clicker training. A clicker is simply used to mark a behavior.
Choices: a. A favorite teacher teaches a parakeet what to expect when it learns to mark a behavior so it knows to follow the cues around the classroom. Find a clicker that they like and can use.; b. You can use anything to mark the behavior that your animal can hear (i.e. a whistle, a bell, a kazoo).; c. A clear notebook, pen or pencil would suffice. The markings you'll need will vary depending on your behavior.; d. A clicker should be anything that accurately describes your parakeet's behavior. You can purchase clickers at your local pet store or online.;
b.