The tone of Oscar Wilde's critique in The Importance of Being Earnest is

aggressive.

serious.

humorous.

angry.

The tone of Oscar Wilde’s critique in The Importance of Being Earnest is humorous.

He is using humor to show how much he hated the Victorian era which forbade people to truly be free and themselves. He often overexaggerated while creating his characters for The Importance of Being Earnest so as to mock the entire era, while being sarcastic and witty.