The correct answer is option 'D', which means that all of the given options (a) Electroplating, (b) Galvanizing, and (c) Anodizing are industrial applications of the chemical effects of electric current. Let's explore each of these applications in detail:

1. Electroplating:
- Electroplating is the process of depositing a layer of metal onto a surface using electric current.
- It is widely used in various industries to improve the appearance and protect the surface of objects.
- The object to be electroplated is made the cathode and immersed in a solution containing metal ions of the desired plating material.
- The anode is made of the desired plating metal, and when electric current is passed through the electrolyte, metal ions from the anode are reduced and deposited onto the cathode.
- Electroplating is used for applications such as coating jewelry with gold or silver, enhancing the corrosion resistance of metal objects, and providing a decorative finish to products like faucets, automotive parts, and household items.

2. Galvanizing:
- Galvanizing is the process of coating iron or steel with a layer of zinc to protect it from corrosion.
- It is commonly used in the construction industry, particularly for structures exposed to the elements.
- The object to be galvanized is immersed in a bath of molten zinc, and an electric current is passed through the bath to facilitate the process.
- The zinc layer acts as a sacrificial anode, protecting the underlying iron or steel from corrosion by providing a barrier and preventing direct contact with moisture and oxygen.
- Galvanizing is used for applications such as galvanized steel pipes, roofing materials, fences, and structural components.

3. Anodizing:
- Anodizing is the process of forming a layer of oxide on the surface of a metal, typically aluminum, by electrolysis.
- It is widely used in industries to increase the durability, corrosion resistance, and aesthetic appeal of aluminum products.
- The object to be anodized is made the anode and immersed in an electrolyte solution, while a cathode is also present.
- When electric current is passed through the electrolyte, oxygen ions are released at the anode and react with the surface of the metal, forming a layer of aluminum oxide.
- Anodizing can produce various colors on aluminum surfaces and is used for applications such as architectural finishes, automotive parts, consumer electronics, and aerospace components.

These industrial applications demonstrate the practical use of the chemical effects of electric current in enhancing the properties and appearance of various materials.