**Core Concept**
The Factory Act 1976 is a law governing working conditions in factories in India, emphasizing worker safety and welfare. This question pertains to the regulation of working hours to prevent worker fatigue and ensure a healthy work-life balance.

**Why the Correct Answer is Right**
The Factory Act 1976 stipulates that no adult worker should work more than 48 hours per week. This includes both regular working hours and overtime. The law aims to prevent worker fatigue, which can lead to accidents and decreased productivity. By limiting working hours, the Act promotes a safe working environment and encourages employers to adopt more humane labor practices.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is likely incorrect, as 40 hours is a common standard for working hours in many countries, but it is not the maximal permissible limit under the Factory Act 1976.
* **Option B:** This option may be too low, as it does not account for overtime or emergency situations that may require extended working hours.
* **Option C:** This option is likely incorrect, as there is no evidence to suggest that the Factory Act 1976 sets a limit of 56 hours per week.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the Factory Act 1976 is a comprehensive law that covers various aspects of worker safety and welfare, including working hours, health services, and fire safety measures. Employers must comply with these regulations to ensure a safe working environment.

**Correct Answer:** 48.