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". 

[header] How to band a goat [title] Purchase an elastrator from a farm and ranch supply store. [step] It is a metal tool that is used to secure the rubber band around the scrotum. [title] Buy castration bands. <sep> (A) [step] They can be purchased from your local farm supply store or from a municipal livestock supply store. [title] Buy a leather or gauze band. (B) [step] Don't use household office supplies for banding. The bands should be thick enough and tight enough to lead to castration within a few weeks. (C) [step] These are simple, metal with metal screws, two prongs, and a ribbon loop on either end. [title] Cut a small hole in each long length of the band. (D) [step] It is a device that attaches the separate rubber bands, wires, tubing and pieces of cork/plastic. It is available at local farm supply stores, ranch supply stores and hardware stores.
B

[header] How to take care of butterflies [title] Start with baby caterpillars. [step] If this is your first time raising caterpillars, you might want to start with a caterpillar kit. You can order a kit online and choose from a variety of butterfly species. <sep> (A) You can store all your butterflies at once in the kit. Just make sure not to overpack them in 1 location. (B) [substeps] Choose a caterpillar you'll be able to collect for some extra protection. You don't want a caterpillar whose wings are incredibly weak. (C) Make sure that the caterpillar is about 3 feet (0.6 m) in length. [substeps] If it is not small enough, you will have to wait several hours before you begin the process. (D) The kit will come with everything you need to raise the caterpillars into butterflies. If you prefer, you can instead find caterpillars in your neighborhood and provide what they need to become healthy butterflies.
D

A camera pans around a large group of people are seen kite surfing along the water while some sit on the sides to watch. more clips <sep> (A) are shown of people riding down the river as well as speaking to the camera. (B) are shown of people riding around on boats and more photos of others flying kites on a lake. (C) are shown of people riding around along the water with some falling in and others standing back up. (D) are shown of people following the group and cannonsn't panned over many of them.

C