____ is a kind of sedimentary rock that is made of plant remains buried under the earth.

Answer: B. Coal

The correct answer is B) Coal.
Coal is a unique sedimentary rock formed from the remains of ancient plants that grew in swampy forests millions of years ago. As these plants died, they were buried under layers of sediment and subjected to intense heat and pressure, eventually transforming into a solid, carbon-rich fuel. Unlike sandstone or limestone, which are made of minerals or shells, coal is entirely organic.

Answering after opening this box earns no Practice Points.