Final answer:
The correct journal entry for purchasing inventory for cash using the perpetual inventory system is to debit Inventory and credit Cash, representing an increase in inventory and a decrease in cash.
Step-by-step explanation:
When a company purchases inventory for cash using the perpetual inventory system, the correct journal entry to record the transaction by the buyer would be to debit Inventory and credit Cash. This entry reflects that the inventory on hand has increased (debit) while the cash on hand has decreased due to the payment (credit). In this case, options involving Cash Discounts or Purchases are not applicable, as cash discounts are typically recorded when they are taken, and the Purchases account is used in a periodic inventory system rather than a perpetual one.