What must an FNS unit always respond to during the certification period?

The correct answer is that an FNS (Food and Nutrition Services) unit must always respond to all reported changes during the certification period. This encompasses any updates provided by clients regarding their circumstances, which can affect their eligibility or benefit levels.

Responding to all reported changes is crucial because it ensures that households receive the correct amount of assistance based on their current situations. Changes can include variations in household size, income, employment status, or living arrangements. By taking all reported changes into account, FNS units maintain the accuracy and fairness of the assistance program, ensuring that support is allocated based on the most up-to-date information.

In summary, the emphasis on responding to all reported changes reflects the commitment to providing equitable support to those in need, and it adheres to the regulations and practices governing food assistance programs.