The Long March-6 rocket was launched by which among the following countries recently?
[A]United States

China has successfully launched a newly-developed carrier rocket Long March-6, capable of taking satellites into the orbit, as part of the country’s space program. The 29.3-meter- long rocket carried 20 micro satellites into the space, which are due to be used for experiments in technology and new products, adding that the new carrier rocket uses a fuel composed of liquid oxygen and kerosene, which is purportedly free of toxicity and pollution. Based on a 2011 policy paper, the Long March-6 rockets are expected to be capable of putting not less than one ton of payload into the orbit at an altitude of 700 kilometres.