What must contractors certify regarding contributions when submitting a proposal?

When contractors submit a proposal, they are required to certify that they have informed each person of the limitations on contributions. This requirement is in place to ensure transparency and compliance with local laws regarding campaign contributions and other forms of financial support. By notifying individuals about these limitations, contractors help to maintain an ethical environment in the procurement process and reduce the risk of conflicts of interest.

The other options, while they may seem relevant, do not directly correspond to the specific certification needed when submitting proposals in this context. Certification regarding tax regulations, project funding, and the absence of contributions from subcontractors, although important in various business practices, does not focus on the critical requirement concerning the awareness of contribution limitations, which is essential for fostering integrity in the contracting process.