What is the relationship between 'energy company' and 'natural gas' in the context of the input sentence.
Options: product/material produced, director/manager, creator, developer

federal energy regulators on Tuesday alleged traders at the U.S. arm of French energy company Total SA (Paris: FR0000120271 - news ) manipulated the natural gas market in the southwestern United States between June 2009 and June 2012.
product/material produced