The correct answer is: Ron’s parents died when he was very young. He and his sister were brought up by their grandparents.
The verb “die” is in the past simple tense because it is a completed action. The verb “bring up” is in the passive voice because Ron and his sister are the recipients of the action.
The other options are incorrect because they are either in the wrong tense or the wrong voice. Option A is in the past participle form, which is used for passive voice. Option B is in the simple present tense, which is used for habitual actions. Option C is in the past simple tense, but it is in the active voice. Option D is in the past participle form and the passive voice, but it is the wrong order.
I hope this explanation is helpful. Please let me know if you have any other questions.