user
It describes an era in history during which lights was hard to come by
A: hard wheat
B: bunting
C: gotham city
D: pupil
E: darkages
assistant
<|begin_of_thought|>

Deep Thought is thinking for 7.5 million years.

<|end_of_thought|>

<|begin_of_solution|>

E

<|end_of_solution|>