Final answer:
A control whose primary purpose is to ensure greater input accuracy is preformatted screens. Written approvals and confirm input acceptance also contribute to input accuracy, but their primary purposes are broader, including authorization and confirmation of successful data reception.
Step-by-step explanation:
The question pertains to the type of control mechanism within business systems, specifically regarding input accuracy. Among the listed options, preformatted screens are designed with the primary purpose to enhance input accuracy. These screens use specific fields and formats that guide the user to enter data correctly. While written approvals and a system to confirm input acceptance also contribute to input accuracy, their roles encompass broader aspects of verification and validation beyond just input accuracy. For example, written approvals may also aim at ensuring that a transaction has been authorized properly, and confirming input acceptance is often more about verifying that the system has successfully received the input.
Moreover, in the context of ensuring accuracy in a document within Microsoft Word, users can click the Review tab above the tools ribbon to accept or reject changes. This relates to the overarching concept of maintaining data integrity and accuracy through various means within technological systems and business processes.