Natural gas
has octane as its primary component
produces less green house gases per energy unit than oil or coal
was discovered by bunsen in 1885
will be depleted by 2030
is transported primarily by truck and rail

The answer of the question can be answered by eliminating the wrong answer. the primary component of natural gas is methane, it was first discovered by chinese is 500 BCE and natural gas is transported using pipelines. so the possible answer would be it produces less green house gases per energy unit than oil or coal

Which of the following did you identify correctly