What to Replace

This map is based on Trevor's "Which Doesn't Belong". 

For this map, you will be given a set of four options, one of which doesn't belong and needs to be replaced with the option immediately below it. 

Each level has a reason for why the odd one out doesn't belong. 

For some levels, there are multiple things with differences, but only one of them actually comes with a replacement that belongs with the rest. 

At the end, there is a spot the difference with five pairs of buildings of which four pairs are different while one pair is identical, and the answer changes each time you get it wrong.