PLZZZ HELPPP IF U SEE THIS!! Read the passage.

Nineteenth-century houses were typically heated with anthracite (a hard, rocklike, fossil fuel.) This natural resource, which many people simply called”hard coal”, was also used as fuel for trains and machines during the Industrial Revolution.

Which term in the passage is defined by the phrase in parentheses?
O anthracite
O fossil fuel
O rocklike
O natural resources