Sandra wants to purchase necklaces that cost $4.99. She already purchased 3 bracelets for $8.97. Which of the following functions relates the amount of money she has spent with the number of necklaces?
A: y = 4.99x + 8.97
B: y = 4.99x +3
C: y = 8.97x + 4.99
D: y = 8.97 + 3