An account increase has no universal cash sign; the two operating-asset increases are subtracted in the bounded bridge.
The receivable and payable rollforwards explain timing against collections and payments, while the inventory change remains distinct from gross purchases and settlement.
A bounded operating-liability increase indicates settlement lagged the applicable accrual amount and is added in the bridge.
Ordinary operating Inventory and supplier-payable movements can be relevant, subject to account scope and noncash-movement controls.
Answer: B
Accounts Receivable and Inventory are operating assets, so their $2,000 and $4,000 increases are negative adjustments under the stipulated rollforwards. Accounts Payable is an operating liability, so its $1,000 increase is a positive adjustment. The combined effect is negative $5,000. Choice B also preserves the required control: acquisitions, write-offs, currency effects, and reclassifications can make raw net changes incomplete.