Which of the following is an example of text classification?

Correct answer: Classifying an email as spam or legitimate

Text classification assigns written content to predefined labels, often by learning patterns in words or other language features. An email-spam filter examines the message and assigns it to categories such as spam or legitimate, so option A is correct. Resizing an image is an image-processing operation, changing audio volume is sound processing, and making a chair is a physical manufacturing activity rather than a language task.