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:
We see a rowing machine in a exercise room. a lady <sep> (A) picks up a machine and lifts it to her shoulder, then drops it. (B) starts putting her feet in the turning machine. (C) sits on the seat and pulls the cord of the rowing machine. (D) pushes a machine.

Ex Output:
C

Ex Input:
[header] How to find the number of a blocked call [title] Get an private branch exchange (pbx) account. [step] One option is asterisk, a free, open source software. Another is switchvox. <sep> (A) This will also work better than 200 blackwire. If you buy one, it will work with the same account ($ 0.11). (B) The pbx is considered to be a free exchange. While this service typically does not have much use for a desktop account, it gives you access to many anonymous call accounts. (C) A pbx converts your computer into a telecommunications device and will allow you to manipulate incoming call data to identify blocked callers. [substeps] Before embarking on this method ensure that you thoroughly understand the technical challenge it presents and the potential financial burden it incurs. (D) Without switchvox here you are on better business. No other option is available to get a contact number from an online website.

Ex Output:
C

Ex Input:
He starts to play with his eyes closed and he seems to be really intensely into playing his music. he <sep> (A) is playing a song, he stops to take a breath for a moment and then continues on with his song. (B) starts to go fast on his harmonica trying to move his hands while he is doing that and then stops for a moment and just starts to play until finally stopping too the own. (C) starts to play faster and harder while he looks down at the camera and keeps playing and rubbing his eyes. (D) makes a fist then takes into his hand several different photos of his songs, songs he has written about his experiences with music and this is driving him crazy.

Ex Output:
A