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". 

Example Input: [header] How to transport breast milk [title] Ask about the terms of transport. [step] If you are sending your breast milk to a company, such as a breast milk bank, ask in advance about the terms of transport. Questions to ask include : [substeps] When does the milk need to arrive? How long can it take to get there? Does the company accept milk packed with dry ice? If so, in what quantity? [title] Use fresh milk. <sep> (A) [step] Milk is changed on a daily basis. Most manufacturers now sell their new milk cold, rather than reheating it in the microwave. (B) [step] Do not store a whole breast of milk in the microwave. Instead, fill a jug filled with fresh milk and microwave it on high heat for 30 to 60 seconds. (C) [step] You can find fresh milk in some commercial stores in bulk. Be careful of doing so; it may cost a considerable amount of money. (D) [step] If you are going to ship breast milk, make sure it is fresh. Either pump it immediately before mailing, or remove the correct amount from the freezer.
Example Output: D

Example Input: A small group of girls are first seen walking out on a gymnasium floor with several people watching on the sidelines. the girls <sep> (A) come together on a patch and begin performing dance moves with one another. (B) begin dancing and flipping with one another slowly back and fourth. (C) then perform a routine using batons while spinning and twirling. (D) then begin performing a routine on a step stool and ends with them getting back in the circle of walkers and dancing on the spot.
Example Output: C

Example Input: [header] How to release butterflies at a wedding [title] Contact a reputable butterfly breeder. [title] Decide how many dozen butterflies and the species you wish to release. [step] Butterflies are sold by the dozen and a good release usually consists of between 3-6 dozen. <sep> (A) [title] Purchase or borrow a few butterflies from a breeder. [step] They are very cheap, so they will be easy to find once you are ready to release them. (B) [title] Decide what kind of butterflies you intend to release. [step] Make arrangements to house the first twenty butterflies you plan to release. (C) Other kinds of butterflies are available at garden centers, music stores, vintage stores or online. [substeps] Take into account where the butterflies and species you wish to release will be. (D) Monarchs are the most-requested butterfly, but other species are available at different times of the year. [title] Decide how you want to release them.
Example Output:
D