Correct option is D
The employment of casual workers in many workshops and factories is primarily driven by economic considerations and workforce flexibility. Casual workers provide a cost-effective solution for businesses to adjust their labor needs in response to production demands without incurring the financial and legal obligations associated with permanent employment. The key reasons include the ability to hire and fire these workers as per business needs, saving on salaries and benefits typically owed to permanent staff, and the willingness of casual workers to work extended hours without extra compensation. This practice reflects broader labor market trends where businesses seek to maximize profitability and operational efficiency at the expense of job security and fair labor practices for workers. It raises important questions about labor rights, the quality of employment, and the broader socioeconomic impacts of such employment practices.