Think about the episode. What causes the Ubuntu to crash? A.The bizarre object on the hull detonates into bits. B.The pilot assaults a member of the crew and is detained in the sick bay. C.The spaceship's mechanical robot malfunctions. D.The spaceship's computer system is exploited by an unknown source.

Based on the options provided, the correct answer is D. The Ubuntu crashes because the spaceship's computer system is exploited by an unknown source.