Which of the following statements about metamorphic rocks and their characteristic environments is true? choose one: a. blueschists are found in the mid-ocean ridge. b. gneiss is found in metamorphic aureoles surrounding plutons. c. slate, phyllite, schist, and gneiss are found in areas of continental collision. d. mylonites are found along convergent-plate boundaries where magma is rising.

C) Slate, phyllite, schist, and gneiss are found in areas of continental collision

Explanation:

The only true statement among these options is option C: Slate, phyllite, schist and gneiss are all metamorphic rocks. This means that, when exposed to incredibly high levels of pressure and temperature, they will change radically (basically, they recrystallize into brand new minerals and structures) while still holding a solid form.