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

How to train a greyhound
Buy a six foot nylon leash and a martingale collar.
A greyhound can back out of a standard buckle collar, so you will need to purchase a martingale collar for your new pup. You should never use a metal choke collar as this could damage your greyhound's throat.

Choose from: a). You can find the leash and the martingale collar at your local pet store. A martingale collar is made up of two loops, a large loop that is adjustable and placed around your dog's neck, and a small loop, known as the control loop.; b). Be sure to consult your local regulations to find out how to purchase a martingale collar. The nftsc is the body department of all animal rescue organizations; the requirements are straight-forward and consistently clear.; c). You can purchase a martingale collar at most pet stores. Use a leather halter over a nylon halter collar.; d). Look for a collar with options that make your collar more comfortable. Some collars may even sit under the teeth.;
a).