instruction:
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". 
question:
[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.
answer:
C


question:
[header] How to act during a fire drill [title] Stay calm. [step] Do not panic when you hear the fire alarm. Also, it's important to stay quiet so you can hear any instructions. <sep> (A) Also, do not get caught panicking. Staying calm will help you calm down as the fire clock ticks and alarms go off at regular intervals. (B) [title] Do not attempt to push the drill to divert the fire. [step] Do not attempt to push the drill at people or leave the master fuse unattended. (C) Turning to your cell phone or microphone can be deadly! [title] Stay warm. [step] Do not wait until the fire is out to stay warm! Your body temperature can drop, but it's better to stay near a heat source. (D) [substeps] In fact, it's important to be quiet and calm the whole time the fire drill is happening, not just when it starts. [title] Treat the alert as if it were a real fire.
answer:
D


question:
[header] How to style thick hair for men [title] Get a textured hairstyle if you have short thick hair. [step] Short, thick hair that is choppy and textured on top will look more styled than if it were all one length. When you're ready to style it, you can spike it up or brush it off to one side. <sep> (A) [title] Go with an undercut if you have medium-length thick hair. [step] Undercuts are long on top and short on the sides and nape of the head, so you can still have length without your hair being unruly or in your face all the time. (B) [substeps] Try side-swept styles because they'll give your hair more volume and will leave you with short layers on top. If you can pull a side side-swept look off with your bangs, try wearing them straight down. (C) [substeps] Get enough frizz and length so that your part isn't too short. [title] Use wax, hairspray, or mousse if you like. (D) You can easily do this with a hairspray if you're holding a lot of hair in one hand and let your arm roll. [substeps] If your thick hair falls below your forehead on the sides, you may also need to use a diffuser to ease that back.
answer:

A