An increased rate of evaporation would allow the funnel to grow increasingly larger as the storm updraft takes in warm moist air at a more rapid rate. This would also increase the strength and speed of the tornado's winds. With that said, your best answer is D.
Answer:
Metamorphic rocks form from heat and pressure changing the original or parent rock into a completely new rock. The parent rock can be either sedimentary, igneous, or even another metamorphic rock.