The correct answer is: A. Commerce
Commerce is the activity of buying and selling goods and services. It is a broad term that encompasses a wide range of activities, from retail sales to international trade. Commerce is essential to the functioning of any economy, as it allows people to acquire the goods and services they need and want.
Option B, industry and commerce, is a broader term than commerce. Industry refers to the production of goods, while commerce refers to the exchange of goods and services. Therefore, option B is not as specific as option A.
Option C, trade and commerce, is similar to option B. Trade refers to the exchange of goods and services between two or more parties. Therefore, option C is also not as specific as option A.
Option D, buying and selling of goods, is the most specific of the four options. It refers to the act of exchanging goods for money. However, it does not take into account the other activities that are involved in commerce, such as marketing, advertising, and distribution. Therefore, option D is not the best answer.
In conclusion, the correct answer to the question “Business means” is A. Commerce.