.....I enough money, I would buy a car.
a) If b) Were c) Had
I go for 'c'. I wonder if there is a grammar reference that says we can use 'HAD' instead of 'IF' in the second conditional
Yes, C. org/conditional-clauses /
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Yes, C. But it's less common omit the 'if'
https://www.grammar-quizzes.com/10-8.html
https://www.englishgrammar.org/conditional-clauses/