user
What has roots that nobody sees, and is taller than trees.  Up, up it goes, and yet it never grows.  What is it?
A: group
B: mountains
C: crystal
D: be
E: progress
assistant
<|begin_of_thought|>

Deep Thought is thinking for 7.5 million years.

<|end_of_thought|>

<|begin_of_solution|>

B

<|end_of_solution|>