A doesn't work for me as it only has one seating area. But if you remove the wall to the study/guest room and make it a sofa/snug area instead then A is good.
However I presume you need a guest room? In which case it has to be B (I guess the middle reception doubles as a guest room). However I'd redesign the extension so it has space for a sofa somewhere near the kitchen, and I don't think the kitchen area needs to stick out quite so far.