Which is the hypothesis found in this introduction?

Metamorphic rocks are rocks which have changed.
Slate is a metamorphic rock made by clay.
An experiment with aluminum foil will prove a theory.
Heat and pressure change rocks from one type to another.

"Heat and pressure change rocks from one type to another". I think this is the answers because they are trying to test to see if pressure are two important elements in changing rocks.

Explanation:I

her eyes water as she let her go

her mothers hand goes limp

face white and pale

lips blue and stale

she is gone

sadness fills her body

she collapses to her knees

as her mothers disease leaves the girl alone