Answer: is either 
It uses contrasting words like while and not just to connect ideas.
or 
 It uses prepositional phrases such as of her ability to embellish details
Step-by-step explanation:
"It uses dashes to separate a clause that keeps the focus on the main idea." IS INCORRECT. 
" It uses descriptive language to describe the magnitude of the moment." I believe it is wrong because not many descriptive words were used in the sentence.