Discussion
When is a path through a collider blocked?
Answer: B
A collider blocks by default and is unblocked by observing it or any of its descendants, which is the reverse of the rule for chains and forks. That asymmetry is explaining away in graphical form. Observing a parent, or counting descendants, does not enter the rule. Keeping the collider case straight is the whole difficulty of d-separation, and it repays being checked on a three-node example every time.
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