A company sells a climbing kit and uses the periodic inventory system to account for its merchandise. The beginning balance of the inventory and its transactions during January were as follows: January 1: Beginning balance of 18 units at $13 each January12: Purchased 30 units at $14 each January19: Sold 24 units at a selling price of $30 each January20: Purchased 24 units at $17 each January27: Sold 27 units at a selling price of $30 each. If the ending inventory is reported at $357, what inventory method was used: A. LIFO B. FIFO C. Weighted average D. Specific identification E. Retail inventory method