AVAILABLE - kitten is still looking for suitable owners 

OPTION - somebady is interested of kitten but didnt take decision so You can still ask about him and we can think about chose most suitable home

RESERVATION - somebody is decided for  this kitten and we see that this is best home for  kitten so we are only wait till kitten will be ready to move to his new  home

SOLD- kitten live with his new owner in new place