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.
Pressure is air pressure= like when you check tires air pressure to see how much air they have.interact = act in such a way as to have an effect on another. scientific = based on or characterized by the methods and principles of science. hope this helped