参考答案：A

解析：During periods of falling prices last in, first out (LIFO) provides a higher net income than first in, first out (FIFO) or the average cost methods because the items most recently purchased are the ones being sold first and these costs are continually falling increasing net income. Using FIFO during periods of falling prices would cause net income to be lower than LIFO or average cost methods because the first inventory purchased is the first sold but during periods of falling prices this is the most expensive inventory causing net income to be lower.