The most accurate revision of the sentence is the first option: <span>Most students use the Internet to research facts and statistics, to find images to use in papers, and to chat with friends.
This sentence avoids parallelism issues since the grammatical form is consistent throughout the sentence. All the verbs are in the same form (infinitive form) as indicated by the phrases "to research facts and statistics", "to find images to use in papers" and "to chat with friends".
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The other options are incorrect since the phrases in the sentence have inconsistent grammatical forms.
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Answer:
"The house was as still as still, but he thought he could just catch the faintest scratch-scratch in the world."
"Rikki-tikki was just going to eat him up from the tail, after the custom of his family at dinner."
Explanation:
Go looking for more sources is the option. Writing about something you're confused about is not a good choice. Plagiarism is never the right answer. And picking another research topic is not always a possibility and it's nonsensical to just give up on your original topic.