Final answer:
A special sales journal is used to record sales of merchandise on credit, which is the correct answer to the student's question. Other transactions listed do not fall under the special sales journal but have their respective journals.
Step-by-step explanation:
The transaction that would be recorded in a special sales journal is a. sales of merchandise on credit. This type of journal is specifically used to record all credit sales transactions in one place, allowing for better organization and more efficient record-keeping. Other transactions, such as cash sales, payments for credit purchases, adjusting journal entries, and sales of fixed assets like used company equipment (whether on credit or for cash), do not belong to the special sales journal but rather other journals such as the cash receipts journal, cash disbursements journal, general journal, or fixed assets journal.