Final answer:
The revision that best uses subordinating conjunctions to clarify the meaning of the passage is: Reina wanted to please her English teacher, so she worked tirelessly on her Romeo and Juliet essay until she turned it in.
Step-by-step explanation:
The revision that best uses subordinating conjunctions to clarify the meaning of this passage is as follows:
Reina wanted to please her English teacher, so she worked tirelessly on her Romeo and Juliet essay until she turned it in.
In this revision, the subordinating conjunctions 'so' and 'until' are used to show the cause-and-effect relationship between Reina's desire to please her teacher and her hard work on the essay.