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.
After analyzing the punctuation in the sentences with special attention to the use of the colon, we can choose the following one as correctly punctuated:
D. Some of the world’s highest waterfalls can be found in three countries: Venezuela, South Africa, and Peru.
A colon can be used to introduce a list of items in a sentence, but only if the group of words that comes before it forms a complete sentence. For example, if that group of words ends in a preposition or a verb, using a colon would be incorrect.
That is the reason why we can eliminate options A, B, and C. They do not present complete sentences before the colon. With that in mind, we can select letter D as the best option.
Learn more about punctuation here:
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