天気予報に___、明日は雨だそうです。 (According to the weather forecast, it will rain tomorrow.)

Answer and explanation

Correct answer: C. よると

によると marks the source of reported information.
Answer: よると.
Why not the others: よって: によって means by means of or depending on. よく: よく means often. よる: the dictionary form does not link here.

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