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1. The sentence "It's doubtful that it will rain" expresses doubt or uncertainty about a future event (rain).
2. In Spanish, when expressing doubt, uncertainty, desire, emotion, or influence in a subordinate clause, the subjunctive mood is typically used.
3. Therefore, when translated to Spanish, the sentence "It's doubtful that it will rain" would indeed use the subjunctive mood.
4. The correct answer to the question would be: "Yes."
I hope this explanation helps clarify why the subjunctive mood would be used in this context when translating the sentence to Spanish. If you have any further questions, feel free to ask!