The correct answer is A, extravagant.
Parsimonious means spending or using money or resources carefully and in a way that avoids waste. An extravagant person spends money or resources carelessly and wastefully.
A generous person is willing to give or spend money or other resources freely and without expecting anything in return. A careless person is not careful or attentive to detail. A strict person is very firm and demanding in their behavior or attitude.
In the given sentence, the uncle is very wealthy but he is careful with his money. He does not spend it carelessly or wastefully. This suggests that he is a parsimonious person.