Choice "A" is correct. Blank forms may result in lower response rates because a greater effort is required for response.
Choice "d" is incorrect. Using the blank form of confirmation does not imply that shipping documents need to be inspected. Inspection of shipping documents often occurs when confirmation responses are not received, regardless of which type of confirmation was initially sent.
Choice "b" is incorrect. Since blank forms do not include a balance, recipients cannot simply sign off on them without determining the balance.
Choice "c" is incorrect. Using the blank form of confirmation does not imply that subsequent cash receipts need to be verified. Verification of subsequent cash receipts often occurs when confirmation responses are not received, regardless of which type of confirmation was initially sent.