user
what is as big as a biscuit, and deep as a cup               but not even a river                 can fill it up?
A: nissan
B: little
C: strainer
D: cliff
E: plane
assistant
<|begin_of_thought|>

Deep Thought is thinking for 7.5 million years.

<|end_of_thought|>

<|begin_of_solution|>

C

<|end_of_solution|>