Answer:
Option D payment within the discount period
Explanation:
The reason is that the company is already reduced the inventory amount and this transaction requires to reduce the trade receivable account and increase in discount. The entry would be:
Dr Discount account (Expense) XX
Cr Trade Receivable Account XX
The cash received will be separately dealt, I mean the entry will be balancing charge to receivable account.
Dr Cash Account XX
Cr Trade Receivable Account XX