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Is this answer the only correct answer? I think 'c' is correct ,too. I think 'c' is even better because the sky being clear is an evidence that it won't rain. Am I right?

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Omar Ahmed

Is this answer the only correct answer? I think 'c' is correct ,too. Yes. I think 'c' is even better because the sky being clear is an evidence that it won't rain. Yes. Am I right?

Those are both OK, but the question stem is not very idiomatic. In a statement of opinion (think, believe), we transfer any negation in the subordinate clause to the main clause.

I don't think it will rain. / I don't think it's going to rain.

CJ