Multi-choice problem: Continue writing the next sentence in this paragraph:

How to exercise your puppy
Let your pup explore the backyard.
For puppies under 12-18 months of age, self-directed play will fulfill your puppy's exercise needs. In other words, the majority of your puppy's exercise should be exploring, digging, and free play.

Available options:
[-] Having exercise nearby is an excellent way to get your pup accustomed to the outdoors. If you have an outdoor backyard, take your dog for short walks around it.
[-] Therefore, let your puppy roam around your backyard, or an enclosed grassy area that is safe. While your puppy is exploring, supervise your puppy to ensure that it is safe at all times.
[-] If you do not have an outdoor area, get your dog to () the area you want, then let him move around on the floor. Do not let your dog play in grass.
[-] Reducing the amount of play your pup does can also help strengthen his muscles and reduce the chance of injuries. For younger puppies, larger spaces may offer a cool-down.
Therefore, let your puppy roam around your backyard, or an enclosed grassy area that is safe. While your puppy is exploring, supervise your puppy to ensure that it is safe at all times.