PLEASE HELPPim confused Question:Which statement is true of Jenna's monthly electricity bill

A. for every 15 units of electricity used monthly the charges $0.10
B. for each unit of electricity use the charges $10 plus $15 for the first month
c. Jenna has to pay $15 for each unit of electricity used and a $0.10 fixed monthly charge
DJenna has to pay $1 for every 10 units of electricity used plus a $15 fixed monthly charge ​