Acetylene is thermodynamically unstable and readily explodes, therefore it is stored in commercial cylinders used for oxy-acetylene torch for welding. These cylinders contain:
A. (a) Pumice stone saturated with acetone.
B. (b) Charcoal powder saturated with acetone.
C. (c) Dissolved in water to give `0.5M` solution.
D. (d) Dissolved in turpentine oil.