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 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.
C

[header] How to act and dress like emma ross [title] Hair. [step] Emma has gorgeous, shiny blonde hair which she brushes and styles well every day. This means to take very good care of your hair. <sep> (A) Clean your hair at least once a week. Keep it straight and smooth with some left over hairspray everyday. (B) Emma enjoys keeping her hair in mostly ponytails. Sometimes, she has hair-grips or bobby pins to keep her side bangs back. (C) Start by using hair products everyday to ensure your hair doesn't look greasy. Then, if you have long hair (short, curly, tousled or wavy! ), use conditioner with hydrating ingredients. (D) Try running a comb through your hair every day to detangle it just how she likes. This will help your curls look soft and healthy rather than bouncy and uncontrolled.
B

[header] How to make a new employee feel welcome [title] Show them the building layout. [step] Give new hires a brief tour, pointing out things like different departments, restrooms, break rooms, conference rooms, and the offices of vips. People usually don't start to feel at ease until they become familiar with their environment. <sep> (A) [substeps] Provide an informational map and a directory for new hires where they can take in their tour. You may request that new hires' communications be kept up to date. (B) [title] Provide directions to particular times in the day. [step] The hours of day are frequently imprecise. (C) When introducing employees into the workplace, inspire them to make friends in an environment that feels brand new. [substeps] Ask for a room marked " welcoming. (D) [substeps] Be sure to let them know if smoking is prohibited on company property. Point out areas of special interest, like where people like to socialize and where they should never go.

D