The correct answer is - her concern with a party instead of Mr. Bunbury’s health.
Oscar Wilde's The Importance of Being pokes fun at the Victorian society which placed too much importance of irrelevant things. He is using the character of Lady Bracknell to depict this mockery - she is concerned with her party going splendidly instead of worrying about another person's health. The frivolousness of her concern is similar to the general spirit of the Victorian era.
Adverbs are words that are used to modify or qualify the verb, adjective and sometimes another adverb. From the sentence above and from the choices given, the word that is not an adverb is the word because. Thus, the answer is letter D.
2+8+12=22
So 22 people were at Cindy’s party because each guest invited x amount of people
B. the origin of lightning is not an example
hope i helped