According to Text I, WEO-2017 includes a special focus on China because this country has been
(A) suffering from severe problems derived from poor air quality.
(B) blamed for substituting heavy industry and coal for cleaner energy.
(C) responsible for the consumption of 20% of the world´s natural gas.
(D) an undeniable world leader in the areas of wind, solar and nuclear energy.
(E) facing changes in the economic and energy policy that will deeply influence its energy mix.