The correct answer is  A) Galvanizing

Galvanizing is a method of protecting iron from rusting by coating it with a thin layer of zinc. This process involves coating the iron or steel with a zinc layer to protect it from rusting, as zinc is more resistant to corrosion than iron.

 It is important to use galvanization for any iron or steel objects that may face exposure to the elements, as this will help ensure that the metal does not corrode over time. Rancidity, alloy, and pulverizing are other methods for protecting iron from rusting, but none of these are as effective as galvanizing.

Additional Information Option Wise 

1. Galvanizing is the process of protecting iron or steel from rusting by coating it with a thin layer of zinc. This is done to prevent the iron or steel from coming into direct contact with oxygen and moisture, which can cause it to corrode.
2.  Rancidity is the process of spoilage of oil or fat-containing foods due to the action of enzymes or microorganisms, or exposure to oxygen, which leads to the production of unpleasant odors and flavors.
3.  Alloy is a mixture of two or more metals or a metal and a nonmetal, that have been melted together and solidified.
4.  Pulverizing is a process of grinding or crushing a solid substance into a fine powder.

So, therefore the correct answer is A) Galvanizing