What kind of trap has caused parallelism problems in the phrase below? these steps: brainstorming, to outline, rough draft, writing, revising?

The correct answer is Lists after a colon.

Parallelism indicates being parallel or corresponding in some ways.
Parallelism examples are found in ordinary or daily conversations.
Use this as an example:
*Like father, like son.
*Easy come,easy go
*His favorite foods are chocolate, chips, and soft drinks.

Parallelism adds balance and rhythm to sentences in order to give ideas a smoother flow.

Where is the map? explain the choices?