Start with a hook, like a quote of something he said, then make 2 or 3 sentences of things you're gonna be talking about then the thesis should be what you're talkin about and 3 because ofs so the thesis would be like this for example:
Jake Olson was a person to look up to because of his determination, positive attitude, and will to work with others
the answer is D. Some of the world’s highest waterfalls can be found in three countries: Venezuela, South Africa, and Peru.
a colon in a sentence means the auther can end the sentence with a period if he wanted and the sentence would still be correct.
in this case the sentence could be, "Some of the world’s highest waterfalls can be found in three countries."
this still looks and sounds correct and is a fully functioning sentence.
Sorry, What are you trying to ask for?