Final answer:
The correct Spanish phrase to express 'I was going to study' is 'Yo iba a estudiar'.
Step-by-step explanation:
The correct option to say 'I was going to study' in Spanish is Yo iba a estudiar. The pronoun 'Yo' means 'I', and the verb 'iba' means 'was going'. The phrase 'a estudiar' means 'to study'.
Learn more about Spanish verb conjugation