I like the “Milk & Honey” book!
A. Purpose
You have to know what and why you are writing before you can make a plan to write.
Option B, Down
Mom has to descend the basement stairs.
You can get rid of <em>down</em>, because the word <em>descend</em> means to go down.
The answer is A hope that helps
The purpose for which something is predetermined or destined.
An act of appointing, setting aside for a purpose, or predetermining.
A place to which one is journeying or to which something is sent when the package has reached its destination kept their destination secret.