The most reliable way to detect the presence of life on a planet would be by determining whether or not its atmosphere contains methane. This is because methane completely disappears from a planet' s atmosphere through various chemical reactions unless it is constantly replenished by the biological processes of living beings. Which one of the following statements, if true, most seriously weakens the argument?
A: Not all living beings have the ability to biologically produce methane.
B: Earth is the only planet whose atmosphere is known to contain methane.
C: There are other ways of detecting the presence of life on a planet.
D: Some living beings biologically produce only very small amounts of methane.
Choose A, B, C or D as your solution.
A