Children, is the correct answer. If that is not the sentence you told me to look at, you can put it in the comment's
A proper noun is usually understood as a noun that is capitalized. In order to be a proper noun, like any other noun, the word must be a person, place, thing, or idea.
Proper nouns, no matter where they are in the sentence, have their first letter capitalized.
When at the beginning of a sentence, it does not matter whether or not the noun is proper: it is capitalized anyway. This is exactly why you have to learn exactly which words are proper nouns by memorization.
Mrs. Germane praises Charlotte for her high test score.
The author starts the text by giving the glimpse of the skepticism which Amazon.com had faced. The author develops the essay further into the challenges and struggles the company had to face throughout the years. The author then explains how much growth Amazon had by 1999.