In perpetual inventory system we learned from class, if the business purchased $900 inventory and $300 office supplies on account, the accounting entry for the purchase will be: O A. Dr. Inventory 1,200 Cr. Accounts Payable 1,200 O B. Dr. Inventory 900 and Office Supplies 300, Cr. Accounts Payable 1,200 O C. Dr. Inventory 1,200 Cr. Accounts Payable 1,200 O D. Dr. Office Supplies 1,200 Cr. Accounts Payable 1,200