Katie ordered candles that cost $3 each from a website. She was charged a flat shipping fee of $6 and no sales tax. If she spent a total of $54, which equation can be used to find c, the number of candles she ordered?
A3c = 54
B6c = 54
C3c + 6 = 54
D3c – 6 = 54
A3c = 54
B6c = 54
C3c + 6 = 54
D3c – 6 = 54