The correct sentence would be "If I won the lottery, I'd buy a big house." In this case, option B is the correct answer.
We can arrive at this sentence because:
- The expression "I'd buy" in the sentence refers to the expression "I would buy," which is in agreement with the verb "won."
- Furthermore, the two verbs show how an action that if it occurs in the present will provoke another action in the future.
- Therefore, both verbs are centered on the correct verb tenses.
With that, we can conclude that the letter B is the correct answer.
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