Can you explain the correct approach to solve this general accounting question?

Opening and closing inventories were as follows

Pugh Sporting Goods manufactures two types of kayaks: River Explorers and Lake Cruisers. The company incurred manufacturing overhead costs of $320,000 in May. They have decided to allocate these costs based on units produced. During May, the company used 10,500 direct labor hours for River Explorers and 12,000 direct labor hours for Lake Cruisers. In total, the company produced 8,000 River Explorers and 6,000 Lake Cruisers. The amount of overhead allocated to each product, respectively, would be: a) $182,880 and $137,160 b) $140,000 and $180,000 c) $160,000 and $160,000 d) $175,000 and $145,000 e) $168,000 and $152,000