Email, poster, and website are examples of purposes.
What is purposes?
Purposes is motive to do something and gain something out of it.
Because, the purposes of an email, a poster and a website is to gain something. All the three email, poster and website set an objective and to attain something worthy out of it. As email is for acquiring or requesting information. A poster is for eye pleasing designs and information that attracts people and the buy those things. And an website is for gaining information or selling things globally. So, all of these serve a important purposes, that why email, poster and website will come under the example of purposes.
Hence the correct option is, C. purposes.
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