The answer would be A, because of its use of commas, and pauses. Hope I helped.
Answer;
A search engine uses machines to index webpages; a gateway is compiled by experts or librarians.
Explanation;
Gateway pages are pages specially optimized for one search engine and 1-3 keywords. Gateway pages or doorways stand on their own, separate from the rest of a site.
A search engine is a software designed to search for information on the internet.
<span>he believed his soul would be instantly destroyed
</span><span>calmly rubbing its hands together
</span><span>scraping its wings with its hind legs and smoothing</span>
Owing to her lack of experience in the field, she hadn't a clue what she'd just been told.
<span>The answer is the
word Owing</span><span>
Owing is a
Present Participle of the verb :"to owe"
</span>
A synonym of this word that could be used would be as<span> a result of</span>
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