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.
Explanation: it’s not grow because grow is usually used for an example “I’m ready to grow up” you do not say I’m ready to grew up. And also the sentence says every morning so it is venture, ventured is past tense.
