I believe the tone is kind of sad. The mood the author wanted to make was sadness. He wanted you to image him when he was younger. (i hope this helped)
No all the passage are not grammatical and logical
The correct answer is A. Jonah has two ultimate goals: becoming a published columnist and writing a book.
When a sentence contains parallel structure, that means that the same form of a word is used throughout. In sentence A, as you can see, the same form of a verb is used - both verbs (becoming and writing) end in -ing. There is no mixing of forms (like in the other options), which is why only A contains parallel constructions.
