One advantage of conventional natural gas as an energy resource is its .

easy transportation

Explanation:

Natural gas, after being extracted from the ground, can be sent from one place to another, wether by long gas pipelines or by large methane vessels after having gone through the liquefaction process (pass it to the liquid state).

It should be noted that in the case of transport by these vessels, it has the advantage of the possibility of ramifying the distribution without being limited to the location of the gas pipelines.

i think the answer is a, hope this is right, that would be my best guess.