HELP ME MATH PRODIGIES

13. Which situations below involves geometric sequence?

A. Eduardo gets a starting salary of P8500.00 and increase of P 500.00 annually.
B. Gianna saved P 10.00 on Sunday and doubled her saving each day thereafter.
C. House rentals in the city increase each year by P500.00 of the previous year's rental.
D. Mother agreed to increase Jans' monthly allowance by P 50.00 to cope with high cost of living. terms are in a geometric sequence which sum is 8200, the first term is -5 and the​