Answer: B. Personal Idea
Explanation:
Issac Newton's Law of Gravity was made by the one and only, Issac Newton.
He used his time to investigate and discover this law, so choice one, cheating is not correct. Choice three is also incorrect, because the world didn't know about this law, or so much about gravity during that time.
Thus, choice two is correct because it was created and written through his ideas.
So therefore, the answer is choice two, personal idea.
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If you want an online presentation, I think you mean by a website.
Best thing you can find is Google Slides.
if you want a program,
LibreOffice is your best bet. It is completely free and it is for Linux, Windows and possibly Mac.
B. The number of sharks decreases. Explanation: hope it's help i learned about it and you too