To determine the correct answer regarding the guidelines of formal etiquette, we need to refer to credible sources such as etiquette books, experts, or recognized cultural norms. While I can provide some general information, it's important to consult specific guidelines or seek advice from an etiquette professional for a complete and accurate answer.
Regarding the given options:
A. It is typically considered acceptable to eat corn on the cob with your hands rather than using a knife and fork, especially in informal settings.
B. Asparagus spears are commonly eaten with your fingers in both formal and informal settings.
C. Eating a canapé directly from a server's tray is generally considered impolite and against the rules of formal etiquette. Instead, it is customary to take a canapé from a serving tray using a small plate or cocktail napkin.
D. While bread can be pre-sliced or served as a whole loaf, it is usually considered appropriate to tear or break off smaller pieces of bread by hand rather than using a knife.
Referring to the options provided, option C contradicts the generally accepted rules of formal etiquette. Therefore, it would be advisable to choose a different option that aligns more closely with proper etiquette guidelines.