Answer:
D is the correct answer.
Step-by-step explanation:
In this case, it is necessary to mention that the speaker is talking about the past. Option a (grow/ventured) includes the first verb in present, so it is incorrect. B (grow/venture) has both verbs in simple form, so they are also incorrect. Option C (grew/venture) shows the second option in simple form. Finally, in option D we can see that both verbs are in the past tense, grew and venture and that is why it is correct.