I saw a training film on fire safety in the workplace today.BUT THERE ARE NO FIRE EXTINGUISHERS IN HELL AND NO WAY TO EVACUATE!
just dump on top of the sand keep it filled and you will not have grass or weeds .
the beeping noise is telling you that you need to change your battery. if it was squawking because of a fire then the whole house would have woke up from the noise.
I vote for B. Let's not get carried away. It is a deck. You should compact the gravel and that will compact the whole thing.