Final answer:
We cannot determine Deza and Clarice's Secret sign language motto without additional context. Sign language mottos often symbolize strong connections and mutual understanding, resonating with themes such as friendship, loyalty, and the power of silence.
Step-by-step explanation:
The question asks about Deza and Clarice's Secret sign language motto. Unfortunately, we don't have information on a particular text or context that includes characters named Deza and Clarice, nor is there a widely known sign language motto specifically attributed to these characters. Therefore, we cannot provide a definitive answer on what the precise motto is or what it means without more information on the source material.
However, sign language mottos can be important symbols of silent understanding and strong bonds between individuals. Such mottos could embody any of the sentiments listed in the options a through d, from unwavering friendship to the strength found in silence or secrecy.
The quotes provided suggest themes of simplicity, loyalty, and the value of secrecy or silence. Therefore, each of the suggested mottos would have a significant meaning when applied to a narrative involving themes of nature, loyalty, or strategic secrecy.