Jill's class is studying how rocks are formed. Jill's teacher showed them a picture of a type of rock. Then, Jill's teacher made a peanut butter and jelly sandwich and explained that one type of rock is formed when layers of sediment are squeezed and cemented together. After the rock is formed, you can still see the layers in the rock. What type of rock was Jill's teacher trying to help them remember by making a peanut butter and jelly sandwich? A) mineral rock B) igneous rock C) metamorphic rock D) sedimentary rock