Which document signifies someone’s financial responsibility for another person?

The correct answer is the affidavit of support, as it is a legal document that demonstrates a person’s financial responsibility for another, typically indicating that they will provide for the basic needs of the individual. This is often utilized in immigration contexts to show that an immigrant has adequate financial support during their stay in the country.

A power of attorney grants authority to another person to act on someone’s behalf in financial or legal matters. While it involves financial management, it does not inherently signify financial responsibility for another person, but rather enables another individual to make decisions on their behalf.

A last will and testament is a document that outlines how a person's assets will be distributed upon their death; it does not impose financial responsibility during an individual’s lifetime.

A living will primarily addresses medical care preferences in situations where a person is unable to communicate their wishes, focusing on healthcare decisions rather than financial responsibility.

Thus, the affidavit of support is specifically tied to demonstrating ongoing financial obligation, making it the correct choice in this context.