Final answer:
The correct sentence with a transition is 'Clearly, you must keep working outside of class, in order to get to Unit 6 by the end of the semester.'
Step-by-step explanation:
The correct sentence with the transition punctuation is:
Clearly, you must keep working outside of class, in order to get to Unit 6 by the end of the semester.
This sentence correctly uses a comma after the introductory transition "Clearly" and before the conjunction "in order to." The comma sets off the introductory phrase and separates it from the main clause. It helps to establish the proper flow and clarity of the sentence.
Learn more about Punctuation in English sentences