Based on past speeches and presentations, when talking about gravity problems, Bill Burnett says that problems that are not "actionable" are just circumstances.
Bill Burnet is known for being currently the Executive Director of the Design Program at Stanford.
Bill Burnet has also worked on several projects relating to Design Programs, such as the renowned Apple PowerBooks and the Star Wars action figures.
In one of his presentations, Bill Burnet claimed that problems that are not "actionable" are merely circumstances.
Hence, in this case, it is concluded that the correct answer is "actionable."
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