Which document might be requested to support the authenticity of the marriage?

A lease agreement showing shared residence is indeed a strong piece of evidence to support the authenticity of a marriage during a naturalization interview. It demonstrates that the couple has established a life together in a shared environment, which is a key indicator of a bona fide marriage. The lease not only indicates cohabitation but also establishes joint responsibility for a household, which immigration officials may look for as part of their evaluation of marital validity.

The other options, while they may provide some context or support, do not have the same weight as a lease agreement. For example, a prenup document primarily outlines terms of a couple's assets and does not reflect their current living situation or commitment to one another. A single tax return may not accurately represent a couple's finances if they filed separately or if one person is the sole earner, and it does not substantiate cohabitation. Wedding photos can serve as celebratory evidence of the marriage but are often seen as insufficient alone to demonstrate that a relationship is genuine and ongoing. Therefore, the lease agreement stands out as the most compelling evidence of a shared commitment to the marriage.