The atmosphere of Saturn contains which one of the following gas in large quantity ?

Saturn is a gas giant primarily composed of hydrogen (approximately 96%) and helium (approximately 3%). Among the trace gases present in its atmosphere, methane (CH4) is the most abundant, making up about 0.4% of the atmospheric volume. While ammonia, ethane, and other hydrocarbons exist in trace amounts, methane is the most significant constituent among the choices provided. Nitrogen is the primary component of the atmosphere of Titan (Saturn's largest moon), but it is not a major component of Saturn's own atmosphere. Carbon monoxide and sulphur dioxide are not present in large quantities in Saturn's gaseous envelope.