Final answer:
The correct verb to fill in the blank is 'está' because Ignacio is the subject and the correct form of the verb 'estar' (to be).
Step-by-step explanation:
The correct verb to fill in the blank is está.
In this sentence, Ignacio is the subject and 'enojado conmigo' is the adjective phrase describing Ignacio's state, meaning 'angry with me'. The correct form of the verb 'estar' (to be) to match with 'Ignacio' is 'está' because Ignacio is the third person singular.
Therefore, the sentence would be 'Ignacio está enojado conmigo' which means 'Ignacio is angry with me'.
Learn more about Using the correct verb form in Spanish sentences