Question

at these words, in defiance of all court etiquette, both burst out laughing, and in their merriment the emperor himself joined heartily. source: the strange story of rab nooby in this sentence, etiquette means: negotiation between enemies, conducted by a third party rules governing socially acceptable behavior cautionary advice about something imminent indirect (and usually malicious) implication

Explanation:

The context is about behaving in a way that defies court - related norms. Etiquette generally refers to rules of proper behavior in a social or formal setting. In a court, it would mean the rules governing socially acceptable behavior.

Answer:

B. rules governing socially acceptable behavior