Answer:
A. It would increase liabilities by $400.
Explanation:
Merchandise inventory Debit = $400
Accounts payable Credit = $400
Note: We assume that the company used a perpetual inventory system. To record the purchase of inventory on account. As inventory is a debit, it increases the asset site. The normal balance of accounts payable is credit; the liabilities site is increased.
Therefore, option A is correct.