Hi if u want to be a D I think you should go for the 340s bt I personally think 410 can give you a natural look also, u will measure about an E with them if u r a B now bt just because they will be quite big doesn’t mean they can’t look natural. Remember fake boobs measure bigger than they look so if u want to look a D u need to be measuring around a DD/E anyways. It may be easier for u to just for the middle size if u r really undecided tho. I’m having 415 to take me to DD/E from an A cup, Hope this helps a bit.X