What dose it mean to identify the authors purpose?

c. Identify the author's main reason for writing.

Explanation:

That's what it means.

tom comes from a southern part of the hemisphere and down in the south they talk with a lot of slang the family doesnt quiet understand what tom is tryna say becaus ehe talks like a three year old but near the end they finally try and desihper toms letter and its a success i have no idea hwta book this is or how to even answere this question honeslty but i am a really fast typer so i did this actually incrediably quick with the swiftness of the flash

there is no picture just let me know what it is and i can you tho : ) mark me the brainliest ? have a good day