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: The people start the race behind a closed and grated fence, which then opens and allows them to start racing from an elevated platform down onto the paved raceway. the racers <sep> (A) pedal with one person in a white jacket in the lead. (B) pass snow covered stands along a hilly road up above the as they ride up the hill past the tight stands and sandy roads of the garage. (C) sit against the wall on the track as they wait for the race to start. (D) pass through gaps while the passengers attempts to stay ahead.
Example Output: A

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: [header] How to play bassline when playing the piano [title] Find the key and accompanying chords. [step] Determine which key the piece is in, and learn the basic chords for each key signature. In a major key, the one, four, and five chords are always major, and together they make a common chord progression. <sep> (A) [substeps] Alternatively, you can find chords tuner, jokey, or syncopated. This is specific to the piece as well as to the melody. (B) Make your way down the keyboard until you find the four chords for each key. [substeps] If your chord is in, play the note progression key, then the chords numerical row with the two ascending steps. (C) For example, in the key of c major, you can play the c major, f major, and g major chords. [title] Play the root of each chord with your left hand. (D) In a minor key, there's a four-chord pattern that you can vary. [substeps] Note that if you are playing the keyboard at all, you may notice that you shuffle each chord in the same order.
Example Output:
C