Answer: Option B
Explanation: Safeguarding inventory refers to keeping proper records of inventory and protecting it from any kind of damage that may result in loss to the organisation.
The main objective behind safeguarding inventory is to minimize loss of the organisation that is keeping it.
In the given case, second option is the purchase return and it could not be considered a default of the purchaser of inventory.
Hence from the above we can conclude that the correct option is B.