Which is the best explanation for why you may not always be able to observe rocks transforming from one type to another?

Most all rock is transformed beneath the surface of the Earth.
The transformation of rock happens slowly over a very long time period in the geologic time scale.
Most all rock is transformed by molten magma inside a volcano.
The transformation of rock happens faster than we can observe.

Question

Which is the best explanation for why you may not always be able to observe rocks transforming from one type to another?

Most all rock is transformed beneath the surface of the Earth.
 The transformation of rock happens slowly over a very long time period in the geologic time scale.
 Most all rock is transformed by molten magma inside a volcano.
 The transformation of rock happens faster than we can observe.

AdiGirl · Answer

@ThisGirlPretty

Eiwoh2 · Answer

Lol u still need help with this?

FOD · Answer

ಠ_ಠ If you do still need assistance, i would conclude answer B., since it is proven that the rock's transformation takes a long time.

Eiwoh2 · Answer

That works. Can you close this question when you can, @AdiGirl ?