Q: What type of coal is formed at lower temperatures?


Read this paragraph and choose the correct option from the provided answers:

Coal has different grades. Bituminous coal forms at lower temperatures. It contains a lot of sulfur. When it is burned, it causes a lot of pollution. Anthracite coal forms under higher temperatures. This drives off the sulfur, and the coal burns more cleanly.

 Choices:

- clean

- calcareous

- limestones

- bituminous


A:
bituminous