Answer: C. $150,000 credit
Step-by-step explanation:
In the financial statements for year 2, it should be noted that the year 1 retained earnings balance, should be adjusted by $150,000 credit.
The corrections of errors should be treated as the period adjustments before. In this case, the $150,000 overstatement for the cost of goods that was sold in the previous year, will then be credited to the beginning balance of the retained earnings.
Therefore, the correct option is C.