Hello,
The answer is option A "Manufacturing".
Reason:
Manufacturing is the process of taking old products and transforming them into better working items its kinda like a upgrade of the product.
Ex: A video game console into a better game console.....
The answer is not option A because wholesaling is the process that businesses use for commercials, bigger industries, any accessories to add on to their businesses in order to make them run better and to sell more of the product in order to make more money. Its not option C because a extractive industry is a industry that basically uses natural resources and extracts them. Its also not option D because a service could be anything not involving businesses, involving social businesses, etc... Therefore the answer is option B!
If you need anymore help feel free to ask me!
Hope this helps!
~Nonportrit