Choose the word which is different from the rest.

The answer is C. Annoyed.

Happy, delighted, and elated are all words that describe positive emotions. Annoyed, on the other hand, is a word that describes a negative emotion.

Happy is a feeling of joy or contentment. Delighted is a feeling of great pleasure or satisfaction. Elated is a feeling of great happiness or excitement. Annoyed is a feeling of irritation or displeasure.

In the context of the question, the word that is different from the rest is annoyed. This is because the other three words (happy, delighted, and elated) all describe positive emotions, while annoyed describes a negative emotion.