in deep ocean trenches. high in the mountains. in dry environments. deep below the crust.
I gave my students this multiple choice question: The formation of diamonds requires tremendous pressure that is generated

Only one answer is correct among these 4 choices:
- in deep ocean trenches.
- high in the mountains.
- in dry environments.
- deep below the crust.

Could you tell me which one is correct?

deep below the crust.