Option 1: paid up -> means to settle a debt completely, not related to efforts yielding results.
Option 2: paid off -> means to yield good results or be successful after effort.
Option 3: paid in -> means to deposit money, not applicable to efforts and success.
Option 4: paid of -> grammatically incorrect; not a valid phrasal verb.
Hence, Option 2: paid off -> "paid off" is the correct phrasal verb to express that someone's efforts were successful and resulted in a positive outcome, in this case, a promotion -> correct