Which is the 1st soil fumigant?

Answer: Option C

Carbon disulphide is the 1^st soil fumigant.
Carbon disulfide is a liquid-type fumigant sold in metal cans or drums. It penetrates well and does not reduce seed germination.
Carbon disulfide is used in many industries. It's used to make rubber, viscose rayon, cellophane and carbon tetrachloride.