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 polish rocks [title] Choose the right rock. [step] You can polish any stone you wish, but there are certain characteristics of a stone that will make it easier to polish. If you want an easy stone to polish, pick a somewhat softer stone like onyx, limestone or calcite. <sep> (A) [substeps] You can polish diamond, granite or ceramic stones by cutting thin pipe holes or inserting dry mortar into one side of each hole. Look for a stone that resembles a diamond, but not necessarily a diamond. (B) Otherwise, a smoother, more pumice-like stone will be more difficult to polish. [substeps] Emeralds and equilateral manganese are both excellent mineral polishes. (C) Stones that are very hard will take a much longer time to polish. However, though hard rocks take a long time to sand, they yield more shine than softer rocks. (D) Softer rocks will actually work more well, and might look better to polish very old stones, but brighter stones tend to chip quicker. [substeps] Rubies, sapphires, and emerald are good options.

Ex Output:
C


Ex Input:
The group cuts hedges along the side as well as throw them into a bucket and help the older man. the kids <sep> (A) then help create fluff and gives each male hugs. (B) hang them up on large branches to get the look of the finished product. (C) walk around playing with plants and creating a maze. (D) continue to help the other man by gathering leaves as he pushing them back towards the front.

Ex Output:
D


Ex Input:
[header] How to become a civil engineer [title] Apply to colleges with an abet-approved engineering program. [step] In order to work as a civil engineer, you'll need to have a bachelor's degree. When you're researching colleges, read the description of the engineering program to see if it's accredited by abet, formerly the accreditation board for engineering and technology. <sep> (A) You must complete an accredited program in order to be eligible to take the engineering licensure exams required to become a licensed engineer. [substeps] If you can't find the information online, call the engineering department of the school and ask. (B) You'll want a degree from a community college or public institution. [substeps] To get a better understanding of how to obtain a degree, look for schools with parks and other attractions. (C) If it isn't (are you accepted), go to an nbet-approved engineering program. The nbet program consists of 120 four hour courses. (D) The relevant accreditation requirements are often given to engineers who have at least a phd. [title] Consider internship opportunities and work towards higher education.

Ex Output:

A