Correct Answer: calcium carbide

Solution : The correct option is Calcium carbide .

Calcium carbide is a chemical that has traditionally been used to artificially ripen fruits such as mangoes. When calcium carbide comes into contact with moisture, it emits Acetylene gas, which can hasten fruit ripening. However, due to the presence of hazardous residues, this procedure might cause uneven ripening, damage the flavour, and texture of the fruit, and potentially pose health hazards.