Hacer una parrillada basically means to have a barbecue in Spanish. Although you didn't write any options here, I managed to find them elsewhere: la nube, el cielo, la cereza, and el fosforo.
La nube is a cloud, el cielo is the sky, la cereza is a cherry, and el fosforo is phosphorus, which is obviously necessary for having a barbecue. Thus the correct answer is el fosforo.
Food consumption is used as a symbol for social status in the play. The more food is consumed by a person, the higher is his social status and the more prominent people he knows. Oscar Wilde uses the play to show that excessive society.
The Answer is C
Wrongly accusing others and conviction without evidence