Which term describes a highly elaborate and ostentatious display?

The term "flamboyant" is used to describe something that is very colorful, showy, and extravagant, often in a way that is attention-grabbing and ostentatious. When referring to a display, flamboyant typically conveys a sense of over-the-top elaboration that is meant to impress or attract notice, characterized by bold designs, vivid colors, and a general sense of theatricality. This aligns perfectly with the notion of a "highly elaborate and ostentatious display."

Other terms listed do not capture the same essence of extravagance. "Foolproof" refers to something that is incapable of failure, thus unrelated to display. "Fragrant" pertains to a pleasant smell and does not relate to visual extravagance. "Forage" refers to searching for and gathering food, which again diverges entirely from the concept of a display. Hence, "flamboyant" is the most fitting term for this context.