One developmental improvement in narrative story telling involves children ability to make the referents of pronouns clear to the their listener. that is, when they say "she did it" they make it clear exactly who she is. this is an example of improved:

The answer in cohesion.

Explanation:

In linguistics, cohesion refers to the appropiate linking of the different parts of a text. It is different from coherence, which involves larger aspects of meaning; cohesion is mostly grammatical.

The device is in the example is called anaphoric cohesion, which occurs when a previously mentioned subject is referred to again, usually with pronouns.

answer; ethnocentric;