Task: Instance Description Understanding (ontology: Sciences/Biology)

Which of the following definitions best describes the instance 'Mardi Gras'?

A. A celebration observed in several countries on 31 October, the eve of the Western Christian feast of All Hallows' Day. It begins the three-day observance of Allhallowtide, the time in the liturgical year dedicated to remembering the dead, including saints (hallows), martyrs, and all the faithful departed.
B. A slang term referring to a kind of insult, typically non-verbal in nature. Journalist Anna Holmes called the instance "the art of the sidelong insult". Merriam-Webster defines it as "subtle, sneering expression of contempt for or disgust with someone—sometimes verbal, and sometimes not".
C. A transgender person who considers themselves to not be transgender or a transgender person who has not yet made their identity public. When a transgender person comes out, it is said that "the instance cracks".
D. The events of the Carnival celebration, beginning on or after the Christian feasts of the Epiphany (Three Kings Day) and culminating on the day before Ash Wednesday, which is known as Shrove Tuesday. the instance is French for "Fat Tuesday", reflecting the practice of the last night of eating rich, fatty foods before the ritual Lenten sacrifices and fasting of the Lenten season.

Answer: The events of the Carnival celebration, beginning on or after the Christian feasts of the Epiphany (Three Kings Day) and culminating on the day before Ash Wednesday, which is known as Shrove Tuesday. the instance is French for "Fat Tuesday", reflecting the practice of the last night of eating rich, fatty foods before the ritual Lenten sacrifices and fasting of the Lenten season.