The correct answer is in.
The word “in” is used to express support for or approval of something. For example, “I am in favor of the idea” means that you support the idea.
The word “on” is used to express a position or opinion on something. For example, “I am on the fence about the idea” means that you are not sure whether you support or oppose the idea.
The word “of” is used to express possession
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