Which of the Following Best Matches the Description

Which of the following best matches the description?
-Natural gas that has been converted to a liquid.

A) underground mining
B) resources
C) active solar system
D) photovoltaic cell
E) surface mining
F) acid mine drainage
G) geothermal energy
H) secondary recovery
I) resources.
J) liquefied natural gas
K) black lung disease
L) nonrenewable energy sources
M) reserves
N) renewable energy sources
O) passive solar system
P) overburden