15. I want to buy her a hat on her birthday but I don't have enough money.
A. If I had enough money, I would buy her a hat on her birthday.
B. If I have enough money, I would buy her a hat on her birthday.
C. If I had had enough money, I would buy her a hat on her birthday.
D. If I had enough money, I would have bought her a hat on her birthday.
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