In a period of rising prices, which one of the following inventory methods usually provides
the best matching of expenses against revenues?

Answer (C) is correct.
A significant advantage of the LIFO method is its matching of current
revenues with the most recent product costs. When prices are rising
(which is most of the time), the most recent costs are the highest costs,
resulting in higher cost of goods sold and lower net income. The lower
net income means lower taxes.