Final answer:
According to the reference provided, concerning time dilation near a black hole, the correct answer is 'c. 40 years', which is the duration Wei Chen was asked to remain in the human world.
Step-by-step explanation:
The passage given as reference describes a scenario involving an astronaut's experience with time dilation due to the proximity to a black hole. In this case, though the astronaut's clocks measured a time span of 2 weeks, more than 2000 weeks had passed on Earth, which is equivalent to 40 years. Therefore, for the question 'How long was Wei Chen asked to remain in the human world?', the correct answer, based on the reference provided, is 'c. 40 years'.