Answer:
Repetition shows to the reader what the author wants them to take away from the reading. If something is being repeated it is to put emphasis on the topic
Explanation:
The prepositional phrase for this sentence is "go until Friday." The word "go" is a preposition. Think of it as a squirrel and a log. To find a preposition, say "The squirrel (went) [insert preposition] the log." If it makes sense, it is a preposition. Then just find the phrase to go along with it!
Forcefully is the correct answer