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 Q]: [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 A]: C

[EX Q]: A boy with dark hair and no shirt is mowing a dirt patch with small patches of grass using a large, orange, push lawn mower. as the boy <sep> (A) continues, he starts to try and mow the grass with the yellow, wind powered, when he is done, he tosses the mower and walks onto the right side of the yard to break the grass apart. (B) finishes his task, he takes the mower off of the camera frame but instead of disappearing behind the screen, he appears to be zooming in on the grass on the left. (C) mows, he pauses and flashes to the camera and two ends are shown before suddenly zipping back to the beginning. (D) mows the dirt patch, large amounts of dirt come up from the ground in a smog like blizzard.
[EX A]: D

[EX Q]: Two young boys are standing in the room with two tennis rackets in their hand surrounded by three white walls and a glass wall behind them. one of the boys <sep> (A) then grabs the racket that is in his left hand and begins hitting the tennis ball against the wall with the racket. (B) punches the other to the ground and smashes his tennis racket against the wall, winces, and yells at his opponent. (C) then goes behind the wall to grab the racket that the other boy has in his hand and begins hitting a ball against the wall. (D) then takes the ball and bounces it against the wall and the two begin taking turns hitting the ball back and forth.
[EX A]:
D