Which aspect of grammatical morpheme learning shows the greatest uniformity/consistency among children?

Question

Quizplus · Accepted Answer

The developmental sequence for mastering grammatical morphemes shows the greatest uniformity among children. Several studies have demonstrated that children tend to acquire morphemes in a specific order, regardless of their native language. This order includes acquiring present progressive -ing, plural -s, possessive -s, past irregular, past regular -ed, third person singular -s, and auxiliary be. Although the exact time it takes to master all these rules may vary among children, the order in which they are acquired appears to be consistent. The age at which they begin to use these markers may also differ slightly among children, but the same general sequence tends to be followed. Therefore, option B is the best choice.

Which Aspect of Grammatical Morpheme Learning Shows the Greatest Uniformity/consistency