Victoria has a health care plan with a prescription benefit that offers four different options.
option a: $55 monthly premium and $20 co-pay per prescription
option b: $60 monthly premium and $15 co-pay per prescription
option c: $65 monthly premium and $25 co-pay per prescription
option d: $50 monthly premium and $30 co-pay per prescription
if victoria fills an average of five prescriptions each month, which option is the least expensive? (4 points)

option a

option b

option c

option d