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 start a taxi company [title] Investigate whether there's a need for a taxi company in your area. [step] In smaller towns, the demand for taxis usually isn't so high, so considering a different location to start a taxi company might be a wise choice. [title] Determine your niche. <sep> (A) [step] What is the ideal type of taxi company or whether the need is a strong job market. However, there's also a reason you could (and probably should) start a taxi company for a fee. (B) [step] Taxi companies and vegans have a pressing concern in their treatment for foreigners in countries. Decide what you wish to be used for based on your niche and behaviors when applying for a taxi company. (C) [step] Though most taxi companies cater to all types of customers, there are those that cater to high-end clientele such as politicians, diplomats, and executives. Other taxi companies offer adapted vehicles for the physically impaired, while yet others provide green taxis for environmentally-conscious customers. (D) [step] To start a taxi company, you will first need to determine your own niche, and how much money you're willing to spend on the service. This is where you'll be able to make the hiring process go more smoothly.

Ex Output:
C


Ex Input:
An introduction comes onto the screen for a video about rock climbing and a man introduces what will happen in the video. a men in a blue shirt <sep> (A) is doing a jump and falling off, then he begins to climb along the rock face with another by him. (B) stands behind a rock wall talking. (C) is shown climbing all the way to the top of a rock. (D) and the interviewer is inside of a gate in a park and he begins by jumping up to the top of a roofed wooden fence to do various things.

Ex Output:
C


Ex Input:
[header] How to clean out a hamster cage [title] Examine the hamster's cage. [step] Before you start to clean, you should take a look at the hamster's cage to see what state it is in. Look for anything that needs cleaning at least once everyday, even if it's not a scheduled cleaning day. <sep> (A) Cleaning your hamster's cage too often or too little can cause them undue stress, so make sure you are cleaning the right amount when needed. [substeps] Look for any droppings or wet areas in the bedding material. (B) [substeps] Look for food boxes on the bottom of the cage, behind the doors, near the hamster's feet. Have a friend help you clean the cage so you can set a schedule and follow it all day. (C) If it seems dirty or has not been cleaned, it is likely rotten. [substeps] Check the hamster's cage for whiteheads, which can be a sign of rotting rodent droppings. (D) [substeps] Check if the cage is lint free, and if anything is old, bacteria-free, or smelling bad. Also check any holes and crevices, so the hamster can't crawl out.

Ex Output:

A