I would disagree. To read would be considered an infinitive. The reason why I think the answer is infinitive is because, I know in Spanish, which is similar to English, to do something ( to read) it was always considered an infinitive. It's an action verb. It's not d because there are no other words following the to read. Hopefully this makes more sense.
Answer:
I feel like they are really irritating.
Answer:

Explanation:
The dove made its nest in the bushes.
⇒ No imperative tone (used in commands)
⇒ No interrogative tone (asking questions)
⇒ No exclamatory tone (Feeling of surprise, indicated by !)