Considering the situation described above, the co-insurance clause of the PPO that Stephanie belongs to is "<u>70/30."</u>
This is because, given that Stephanie would be paying $1,400 from the $2,000 incurred, this is 70% of the total expenses.
Similarly, the PPO will pay $600 after Stephanie's deductible, 30% of the total expenses.
$2,000 × 70% = $1,400
$2,000 × 70% = $1,400$2,000 × 30% = $600.
Hence, in this case, it is concluded that the correct answer is option C. "<u>70/30</u>."
Learn more about the insurance clause here: brainly.com/question/1198575