The correct answer is: A. Vulcanization
Vulcanization is the process of improving the properties of natural rubber by heating it with sulphur. This process makes rubber more durable, stronger, and more resistant to heat and chemicals.
Acceleration is the process of increasing the rate of a chemical reaction. This can be done by adding a catalyst, which is a substance that speeds up a chemical reaction without being consumed itself.
Sulphonation is the process of adding sulphur to a substance. This can be done by heating the substance with sulphur or by adding a sulphuric acid solution. Sulphonation can change the properties of a substance, making it more water-resistant or more acidic.
Galvanization is the process of coating a metal with zinc. This is done to protect the metal from corrosion. Galvanization can be done by dipping the metal in a molten zinc bath or by electroplating the metal with zinc.
In conclusion, the process of improving the quality of rubber by heating it with sulphur is called vulcanization.