The correct answer is Deer
Explanation:
In English language, most words become plural by adding "s" or "-es" to them, however there are exceptions to this rule as some words need other changes to become plural such as "children" that is the plural form of "child" and even some words do not change but are the same in singular and plural, this includes the words fish, moose, sheep, and deer. Considering this, it can be concluded in the case of "Six small ____ came to the edge of the stream" the correct word is "deer" as this is the word used for plural while "deers" is incorrect.
