Im thinking the answer is D. Dangerous. Because he says, "The spaceship metaphor can be dangerous when used by misguided idealists to justify..."
Its B, Because, Present perfect progressive is when you say this, jake has been playing. Past is definitely not, and if past is not it than d wouldnt be it.
A biased website would not be a reliable source for a historian because it would not be for that purpose, rather, it would include poor research and facts.