slightly confused as people only choosing one kind of treat, as I read the OP as being offered a plate which had;
plate 1 - a selection of biscuits
plate 2 - a selection of chocolate wrappped biscuits
plate 3 - a selection of chocolate bars
Unfortunately I don"t think enough information as been given in the OP.
Surely we need to know at what time said choices are given, as obviously plate 1 would be preferred around morning brew time, so say 0930. Plate 2 I would expect around 11, plate 3 is no doubt 3 oclock choc and I notice that a few plates are missing, there should be a plate full of cakes for high tea, around 4. That should keep you going onto tea time, after which we should be presented with plate 5 - puddings, and then a bit later, plate 6 cheese with biscuits and then maybe a small saucer of after eights just before bedtime.
Hope that helps.