Our cardiovascular system gets better when you increase the time and intensity of your workouts. what should the word in italics be replaced with to make this sentence more precise?

Stephanie belongs to a ppo that has a $1,000 deductible. the deductible applies only if stephanie meets with doctors outside her network. there is no co-payment. stephanie incurred a bill of $2,000 when she met with an out-of-network specialist for a thyroid problem. she owes $1,400 out of pocket for the bill. if the ppo pays $600 after stephanie has paid her deductible, what is the co-insurance clause of the ppo that stephanie belongs to? a. 50/50 b. 60/40 c. 70/30 d. 80/20