Introduction:
Commercial farming is a type of agriculture that focuses on the production of crops and livestock for sale, with the primary goal of making a profit. It involves large-scale production and utilizes various modern techniques and inputs to maximize productivity and yield.

Options:
a. HYV seeds
b. Old methods of inputs
c. Small patches of land
d. Skilled labour

Explanation:
1. HYV seeds:
High Yielding Variety (HYV) seeds refer to seeds that are genetically modified to have higher productivity and resistance to diseases and pests. These seeds have been developed through scientific research and breeding techniques. Commercial farmers often use HYV seeds as they help in increasing the crop yield and ensuring a consistent supply of high-quality produce. These seeds are specifically designed to meet the demands of commercial farming by providing higher yields per unit of land.

2. Old methods of inputs:
Old methods of inputs, such as traditional farming techniques and practices, are not commonly used in commercial farming. These methods are often labor-intensive and less efficient compared to modern techniques. Commercial farmers require high productivity and profitability, which can be achieved through the use of advanced inputs and technologies. Therefore, relying solely on old methods of inputs would not be suitable for commercial farming.

3. Small patches of land:
Commercial farming typically involves large-scale production, which requires significant land resources. Small patches of land would not be sufficient to meet the production demands of commercial farming. Commercial farmers often aim for economies of scale, where larger land areas allow for the use of modern machinery, efficient irrigation systems, and other advanced practices. This enables them to achieve higher productivity and reduce production costs.

4. Skilled labour:
Skilled labor plays a crucial role in commercial farming. The use of modern technologies and equipment requires trained personnel who can operate and maintain them effectively. Skilled labor is also required for tasks such as crop management, pest control, and harvesting. Commercial farmers often invest in training and hiring skilled workers to ensure efficient and productive farming operations.

Conclusion:
In commercial farming, the most appropriate option among the given choices is a. HYV seeds. These seeds have been specifically developed to meet the demands of commercial farming by providing higher yields and resistance to diseases and pests. While skilled labor is also essential, it is the use of modern inputs like HYV seeds that significantly contribute to the success of commercial farming.