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".

Ex Input:
[header] How to breed chihuahuas [title] Adopt a chihuahua to breed. [step] If you don't already have a chihuahua, you will need to get one that is ideal for breeding. Contact a breeder that specializes in breeding chihuahuas. <sep> (A) If you are looking to adopt a chihuahua you can breed, you should get it from a well-established and humane breeder that has solid documentation of its lineage. [substeps] Make sure your potential dog is in good physical and mental shape. (B) This is a good option for investors that want to go through a breed-specific final selection process before purchasing a dog from one of the breed-specific breeders. [substeps] Breed chihuahuas can learn complicated rules, including you will need to breed them yourself, or you may be able to substitute a dog from a previous relationship with one that is already bred. (C) Look around for a unique breed, preferably one that offers a wide variety of features. Remember to pay attention to age, as a young chihuahua is a rodent, and a healthy small baby chihuahua needs to be training and raised carefully. (D) Shop around a few different places before settling on one that is right for you. [substeps] Get a volunteer or mentor for this breed.

Ex Output:
A

Ex Input:
[header] How to find the number of a blocked call [title] Get an private branch exchange (pbx) account. [step] One option is asterisk, a free, open source software. Another is switchvox. <sep> (A) This will also work better than 200 blackwire. If you buy one, it will work with the same account ($ 0.11). (B) The pbx is considered to be a free exchange. While this service typically does not have much use for a desktop account, it gives you access to many anonymous call accounts. (C) A pbx converts your computer into a telecommunications device and will allow you to manipulate incoming call data to identify blocked callers. [substeps] Before embarking on this method ensure that you thoroughly understand the technical challenge it presents and the potential financial burden it incurs. (D) Without switchvox here you are on better business. No other option is available to get a contact number from an online website.

Ex Output:
C

Ex Input:
[header] How to oil a saddle [title] Warm the oil. [step] Before you begin oiling your saddle, be sure to warm your oil. The oil needs to be warm (at most 100 degrees fahrenheit or 38 degrees celsius), but not hot. <sep> (A) If you're not used to warming the oil, start with just a tablespoon of oil or butter. Increase the amount, at most, until the oil turns a light amber or orange. (B) Thus, warming it yourself can help keep it lubricated, especially if you have dry skin. [substeps] Add your oils to one gallon-sized basin, cover with warm air, or place in your riding house. (C) Hot oil can cook your leather and ruin it. In order to guarantee that it's the right temperature, try soaking it in lukewarm water for about 20 minutes. (D) If you leave the oil unattended, it can become hard and dangerous for your horse. Use a softened saddle oil that's made of cold or moisture that can repair old saddles, such as saddle powder, saddle balm, or castile soap.

Ex Output:
C