PLEASE!!!!!! I NEED HELP !!!!!!!!!!!!!
Q: In 2013 , the United States Postal Service charged $0.46 to mail a letter weighing up to 1 oz. and $0.20 per ounce for each additional ounce. Which function would determine the cost, in dollars, c(z), of mailing a letter weighing x ounces where z is an integer greater than 1 ?

Possible Answers: A. c(z) = 0.46 + 0.20, B. c(z) = 0.20z + 0.46, C. c(z) = 0.46( z - 1 ) + 0.20, D. c(z) = 0.20 (z - 1 ) +0.46