Answer:
Author's tone is how an author conveys a mood/emotion.
Step-by-step explanation:
Mood can be created through grammar and vocabulary.
For example:
longer sentences make the writing more sombre and solemn.
Another example:
"I am disgusted by his repulsive behaviour"
"Disgusted" and "repulsive" creates an angry tone, rather than "his behaviour was kinda bad" which is way less impactful.
Hope this helps!!