You will be given a definition of a task first, then some input of the task.
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".

[header] How to choose a piano [title] Make sure you want a piano and not a digital keyboard. [step] Nothing quite beats the sound of an authentic piano, but many digital keyboards can replicate the sound of a piano, as well as mimic other instruments. They are also lighter and cheaper. <sep> (A) [substeps] A music keyboard is a device that most piano players use to play a musical instrument. There are usually keys protruding out of the keyboard, and macs have no equalizer. (B) Large keys build up vibration and are also uncomfortable to play on a digital keyboard. [title] Think about how big you want your piano to be. (C) [substeps] Digital keyboards are one of the most expensive things on the market, so get a beginner's keyboard from a store like macy's. [title] Determine how much sound you want to get. (D) [title] Figure out what size and sound you want in a piano. [step] Size matters when it comes to pianos.
Output:
D