Answer: 3.Parallelism
Explanation: “No pain, no gain,” “In for a penny, in for a pound,” “Where there is smoke, there is fire,” and “It takes one to know one” are all parallel constructions.
Parallelism is made of two or more phrases or clauses in a sentence that have the same grammatical structure.
The difference between repetition and parallelism is mainly that parallelism is the repeating of words with just slight adjustments each time. Repetition is repeating the SAME thing "over and over and over" again (see what I did there, THAT was repetition). Other examples of repetition are:
Time after time
Heart-to-heart
Hand in hand
Get ready, get set, go
Home sweet home
It is what it is
BTW sorry i took so long to write and reply to your answer