How do supporting details reinforce the central idea in this main passage?

D

Explanation:

We can cross out A because it doesn't make sense with the context of the passage. B is incorrect because the passage does not include criticisms against new artificial limbs. C is incorrect because the passage doesn't explain how the artificial limbs work. Using the process of elimination, D must be the correct answer as it applies the best to the context of the passage.

they insisted that there was not enough time to learn everything.  

explanation:

if they were going to steal the answers that is simply because they insisted that there was not enough time to learn everything.  

where is the