Answer:
B. $250,000
Explanation:
The option B is the answer because the others option are not part of revenues during the year to the single step income.
The recovery of accounts written off are not part of revenues, it's an adjustment to the allowance for uncollectible accounts.
Then, the Purchase discounts is not part of revenues either, this kind of discounts goes directly to the valuation of inventory and then to the cost of goods.