1. A is a signed agreement.

A signature on a piece of paper is a signed agreement.

Explanation:

A signed agreement is a signature on a piece of paper and is a powerful legal piece between two parties. Even if a document is valid with a signature, courts take into consideration not only the legality, but also the verifiability of the document.

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to act quickly in times of danger to the united states

because you have to act quickly if you want to live/survive.