I'm so tired of these tricky questions. Let me just stare at the image for a bit... Okay, I think D is the safest choice. X, Y, and Z look like the main parts, and 1, 2, and 3 are probably just part numbers or something.
Haha, I bet the test creator is trying to trick us. Of course Y and Z are components, but 1, 2, and 3 are probably just for organization. B is the way to go!
Shasta
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