That rule is applicable . . . . . . . everyone.

The correct answer is C. to.

The word “to” is used to indicate the person or thing that something is directed towards. In this case, the rule is directed towards everyone.

The other options are incorrect because they do not convey the same meaning.

• The word “with” is used to indicate that someone is doing something together with someone else. In this case, the rule is not being done together with everyone.
• The word “for” is used to indicate that something is intended for a particular person or group of people. In this case, the rule is not intended for everyone.
• The word “on” is used to indicate that something is placed on top of something else. In this case, the rule is not placed on top of everyone.

I hope this helps!