Explanation
According to the ASCM CTSC Exam Content Manual, the formula for raw material inventory days of supply is the value of raw materials inventory divided by the "value of transfers divided by 365 days" 1. The value of transfers is the same as the cost of goods sold, which is the total cost of producing and delivering the prod-ucts to the customers 2. Therefore, the formula can be simplified as the value of raw materials divided by the cost of goods sold per day, which is the same as option A. The other options are incorrect because they either use the wrong numerator or denominator, or invert the ratio.
1:12:2