Multi-choice problem: Continue writing the next sentence in this paragraph:

How to position ads on your website
Place an ad on the top fold.
Consulting firm nielsen norman group says web users spend 80% of their time looking at information above the middle of page fold. It can be placed on top of the text and will be the first ad the user will see once the page is loaded.

Available options: (a). Pay attention to these questions : What does this cover? What content do you offer to engage someone other than yourself? Will the ad be relevant to the product or service your site is generating? Break up the ad into pages. Put one large paragraph in each page.; (b). Hang a header to identify the ad with the link beneath. Determine the beginning and end dates for the ad.; (c). The best measurement for an ad in the top fold is 728x90. 728x90 fits perfectly on top of a browser page and is hard to ignore.; (d). Click on the " automatically mark out " button to tag the ad. If you'd like to enter multiple names, your name may be listed first.;
(c).