Answer:
d. a deduction from sales in the income statement.
Step-by-step explanation:
Sales discount: The discount which is given at the time of sale.
The treatment of sales discount is shown below:
Net sales = Sales revenue - sales discount - sales return and allowances
The sales discount is always deducted from the sales revenue to get the net sales amount , and this treatment is shown on the credit side of the income statement. As the income is received so sales account should be credited.
Hence, all other options are incorrect except d. option