Final answer:
The correct option is 1) loyalty.
Faithfulness or allegiance to a cause, ideal, custom, institution, or product is called loyalty, a vital virtue that promotes unity and stability in relationships and societies.
Step-by-step explanation:
Faithfulness, or allegiance to a cause, ideal, custom, institution or product is called loyalty. Loyalty is a devoted adherence that individuals exhibit towards something they hold in high esteem, whether it be to a nation, those in authority, cultural heritage, or sacred religious practices. The concept of loyalty is recognized and celebrated across various dimensions of life and societal structures, from patriotism - a deep-rooted loyalty to one's country - to religious observance, and even in personal commitments such as marriage.
Loyalty is the virtue that fosters stability in relationships and societies. It brings about unity, as people supporting a common cause or value system work together harmoniously. Within the kaleidoscope of human experience, loyalty is a thread that weaves individuals into the fabric of the community, strengthening bonds and ensuring continuity of traditions and beliefs.