Matthew spent \$4 on a box of chocolate that contained 12 pieces. Which choice shows the money spent per chocolate?

Step 1 ：Let the total cost be \(c\) and the number of chocolates be \(n\). We are given \(c = 4\) and \(n = 12\).

Step 2 ：To find the cost per chocolate, we can divide the total cost by the number of chocolates: \(\frac{c}{n}\).

Step 3 ：Substitute the given values: \(\frac{4}{12}\).

Step 4 ：Simplify the fraction: \(\frac{1}{3}\).

Step 5 ：Convert the fraction to a decimal: \(0.33\).

Step 6 ：\(\boxed{0.33}\) is the cost per chocolate.