What Journal Entry Is Required When Inventory Is Purchased Under $\mathrm { Cr }$

What journal entry is required when inventory is purchased under the periodic inventory system?

A) Dr Cost of goods sold
$\mathrm { Cr }$ Inventory
B) Dr Cost of goods sold
$\mathrm { Cr }$ Inventory
Cr Purchases
C) Dr Inventory
$\mathrm { Cr }$ Accounts Payable
D) Dr Purchases
$\mathrm { Cr }$ Accounts Payable