In this task, you are given a context and four options. Each option is a suggested ending for the context. You should read the context and pick the best ending for the context. Please answer with "A", "B", "C", and "D". 

A group of people get off of a yellow school bus with life rafts around their neck and enter a foliage filled area leading to a body of water. a man on a motorized boat <sep> (A) takes off from a dock then by helicopter is at the shorefront landing pad where they begin kayaking. (B) gets together in water and drinks a bottle of sunscreen skin. (C) goes through the water into and many trees, one of which looks like it is a swirling green leaf blower. (D) talks to the camera while sitting on the edge of the inside of a boat in front of the boat steering wheel.
D

[header] How to befriend dogs [title] Make sure the dog is friendly. [step] When approaching a strange dog, be particularly aware of its body language. If an owner is present, ask the owner if the dog is friendly. <sep> (A) Make sure the dog wants to be petted. You can easily alienate a dog by approaching one that is nervous or agitated. (B) If a dog seems hesitant to meet you or extends its hand to you, it's the opposite of friendly. [substeps] Avoid approaching a dog by walking near it and stopping so that the dog can see you. (C) Usually, a dog looks friendly when greeting a stranger but when the dog is not, try something more benign. [substeps] Some common signs of friendliness on dogs are legs waving, laughing, and shoulder-shaking. (D) Common signs of friendly behavior are not always direct stares. If a stranger approaches the dog, its body language may indicate a definite dislike.
A

[header] How to castrate a horse [title] Get your horse assessed by a veterinarian. [step] Your vet will need to assess your horse before the procedure and talk to you about the options for castration surgery. Some horses will be able to be castrated under sedation while at home in his stall, while others will need to be castrated under full anesthesia in a clinical setting. <sep> (A) [substeps] If your horse has a medical condition that does not require treatment, he may not be given castration surgery. If the hoof was cut during the procedure, this may be more than relevant to your horse. (B) [substeps] For many horses, castration surgery is the safest option for a horse. If your horse is unaware of the possibility of anesthesia surgery, surgery will be the safest option for them at home. (C) Be aware that castration surgery can only be performed in certain conditions. [substeps] Like surgery, the process will require pressure on the horse's head and other internal organs to be numbed with gauze or a surgical bandage. (D) [substeps] If the horse is healthy with two scrotal testicles, then the veterinarian may opt to to sedate the horse and operate using local anesthesia. This may be done in the field or at the clinic.

D