The correct answer is C. Very rich.
The phrase “rolling in money” means to have a lot of money. It is often used to describe someone who is wealthy or who has a lot of disposable income. In the context of the question, it is clear that the person in question was very rich, as they were able to spend money without worrying about their finances.
The other options are incorrect because they do not accurately describe the meaning of the phrase “rolling in money.” Option A, spending more than his income, is incorrect because it suggests that the person was in debt. Option B, borrowing money liberally, is incorrect because it suggests that the person was living beyond their means. Option D, wasting a lot of money, is incorrect because it suggests that the person was not careful with their money.
In conclusion, the correct answer to the question “In his youth, he was practically rolling in money” is C. Very rich.