PLEASE HELP!! FAST

Which statement describes the cost to park as a unit price?
A) Ari paid 1 quarter to park for 15 minutes at a parking meter.
B) Brianna paid 30 cents to park for 30 minutes at a parking meter.
C) Caesar paid 12 dollars to park for 1 day in the airport parking lot.
D) Deanna paid 70 dollars to park for 7 days in a city parking lot.