Final answer:
Using FIFO during periods of rising prices leads to lower COGS and higher profits due to the accounting of cheaper, older goods as sold first.
Step-by-step explanation:
The impact of the FIFO (First In, First Out) inventory method on the cost of goods sold (COGS) and profits depends on the movement of prices. When prices are rising, FIFO results in lower COGS because the older, cheaper goods are recorded as being sold first. This leads to higher reported profits because the newer, more expensive goods remain in inventory and do not affect COGS as much. Therefore, the correct answer is: a) FIFO results in lower COGS, leading to higher profits.