In which of the following situations does Alex's hourly wage change by a constant percent per unit change in year?

A. Alex's starting hourly wage is $14.50 per hour the first year, and it increases by $1.50 each year.

B. Alex's starting hourly wage is $13.00. She receives a $0.50 per hour raise after one year, a $0.75 per hour raise after the second year, a $1.00 per hour raise after the third year, and so on.

C. Alex's hourly wage is $20 per hour in the first year, $22 per hour the second year, $24.20 per hour the third year, and so on.

D. Alex's starting hourly wage is $15.00. Her hourly wage is $15.75 after one year, $17.00 after two years, $18.75 after three years, and so on.

I think the answer is A, can you correct me if I am wrong.