Thanks to @Elan Perach for the answer that solved the problem for me. Here is an alternative method that may be preferred, depending on your needs:
You can stop showing a specific remarketing campaign to users who visit a โspecific pageโ by adding the Campaign audience exclusion (Campaign> Display Network> Interests and Remarketing> Campaign audience exclusions).
So, citing Elan's answer, you create audience B ("Everyone who visits this particular page") and add it as an exception, but you do not need to create audience C in this way. I found that this reduced the number of clicks, especially if you want to do this for multiple campaigns.
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