Which document makes changes, modifications, and corrections prior to bid opening?

The correct choice is the document referred to as addenda. Addenda are used in the bidding process to communicate any changes, modifications, or clarifications to the original bid documents prior to the opening of those bids. This allows all potential bidders to have the same updated information, ensuring a fair and transparent bidding environment.

Addenda are critical in maintaining the integrity of the bidding process because they address any concerns or necessary changes identified after the initial bid documents are distributed. This document can include revisions to specifications, changes in project timelines, or adjustments to any bidding requirements.

Other options, while related, serve different purposes. For instance, change orders come into play after a contract has been awarded and are used to formalize changes to the scope of work within the contract. Supplemental instructions provide guidance or clarification during the execution of the contract rather than before bids are received. Revisions can refer to updates made to documents but do not specifically denote changes made prior to the bid opening. Hence, addenda is the most appropriate and accurate choice for changes made before bids are submitted.