The answer is B. Walking slowly
Hello. You have not shown the protocols to which the question refers, which makes it impossible to construct an exact answer. However, I will try to help you in the best possible way.
In order to keep the masks in use of the mask it is necessary that these reminders are spread in places that are easy to see and that they present a striking message, not only informing the obligation to use the mask, but highlighting the problems that can occur if it is ignored.
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D. To show emotion or feeling
Bestie, friends are friends no matter the place. I mean if it is necessary to avoid issue then sure, keep them separate. But if you are doing the same thing with each, just in different places, I see no reason to keep them separate.