Wallowa Company Purchased Supplies Costing $6000 and Debited Supplies for the Full

Wallowa Company purchased supplies costing $6000 and debited Supplies for the full amount. At the end of the accounting period a physical count of supplies revealed $1800 still on hand. The appropriate adjusting journal entry to be made at the end of the period would be

A) Debit Supplies Expense $1800; Credit Supplies $1800.
B) Debit Supplies $4200; Credit Supplies Expense $4200.
C) Debit Supplies Expense $4200; Credit Supplies $4200.
D) Debit Supplies $1800; Credit Supplies Expense $1800.