Answer choice C versus D

Hello @DavidW, I wish I had something to teach you here, but you are exactly right. Self-similarity is about the smaller parts of a whole looking like the whole itself. C does represent this concept, because the vessel pattern of a specific body part matches the pattern of the whole blood vessel system. D does not illustrate self-similarity, because it is talking about different trees rather than parts of a whole.

What question type is this, and what is the takeaway for making sure we get questions like this correct? I can see why D is correct here, having originally picked A, but can see D now that I've re-read. How do you make sure to catch things like this the first time around? Many thanks Anna