When a storyline is learned, the teller can concentrate on dialogue, gestures, and facial expression

This is false.
Suggestions useful for storytelling include maintaining eye contact, speaking in a monotone voice, using a prop and being at the child's level.
This is one is true because in techniques for storying telling one is maintaining eye contact and sitting close to a group.

2 answers

Wondering if you ever have told a story. One can sit close to a group, maintain eye contact, without being an imitation of an English Vicar out of Charles Dickens. Animation of voice, gestures, and tonal changes are essential to story telling. There are a number of great videos on You Tube on how to tell a story.
https://www.youtube.com/watch?v=KxDwieKpawg