Which sentence contains parallel structure?

jonah has two ultimate goals: becoming a published columnist and writing a book.

jonah has two ultimate goals: becoming a published columnist and to write a book.

jonah’s two ultimate goals are to become a published columnist and writing a book.

jonah’s two ultimate goals are becoming a published columnist and to write a book

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.

1 - a

2 - a

3 - c

4 - b

5 - d