Answer:
A
Explanation:
Each year closing inventory is overstated leads to overstatement of net income by the same amount. In year 1, closing inventory was overstated by $160,000, thus overstating net income by the same amount.
In year 2, the closing inventory is also overstated thereby also making net income to be overstated by the cumulative amount ($280,000) but the impoact in year 3 is the overstatement of year 2 amount of $120,000.