Final answer:
The appropriate imperfect form of the verb 'ir' is 'iba.'
Step-by-step explanation:
The appropriate imperfect form of the verb 'ir' to fill in the blank in the given question is option C, 'iba'.
This is because the sentence is in the past tense and the subject 'tu' indicates the singular informal 'you' form. The imperfect form 'iba' represents the action of going in the past, indicating a habitual or repeated action.
For example, 'Yo iba a la Iglesia todos los domingos' would mean 'I used to go to church every Sunday.'
Learn more about imperfect form of the verb 'ir'