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 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.

Ex Output:
D


Ex Input:
[header] How to recycle ice cream containers [title] Inspect the container for recycling info. [step] Check the packaging for any labels that indicate whether or not it is recyclable. However, be aware that these only provide general information and do not reflect whether your community is equipped to process this container. <sep> (A) [title] Obtain personal information such as your name, address, work address, phone number and any other identifying information you might be willing to share. [step] Check to see if you are allowed to remove many of these labels with your children, with the exception of paper bags. (B) [substeps] Not all people in your community will need to take the container to a recycling facility, so always check the interior or exterior of your container carefully before bringing it to a recycling center. Many parts and materials might get damaged when you tip the container, resulting in uneven storage. (C) [substeps] If your container was used for a beverage beverage, it's worth noting that many local beverage shops are still accepting recyclable containers. If your container was used for a beverage beverage, it may be better to recycle it again to get some fresh, whole varieties to replace the old one. (D) Also keep in mind that a lack of labels does not necessarily mean that the container can't be recycled. Labels to look for include : [substeps] Widely recycled: this type of container is recycled by at least 75% of municipalities.

Ex Output:
D


Ex Input:
We see small kids ride bmx bikes on a dirt track in an arena. The kids ride past the camera. the kids <sep> (A) stop a while and walk the grassy area of the arena. (B) start passing the finish line. (C) play on a dirt track. (D) continue to ride in their dirt bikes.

Ex Output:

B


