**Core Concept**
The Factory Act of 1948 is a legislation that regulates labor conditions in factories across India. It sets out specific guidelines for working hours, rest periods, and health and safety measures to protect the welfare of workers. The maximum working hours per week is a critical aspect of this legislation.

**Why the Correct Answer is Right**
The Factory Act of 1948 specifies that no adult worker shall be required or allowed to work in a factory for more than 48 hours in any week. This limit is further divided into a maximum of 9 hours of work per day, with at least one day of rest in every week. This provision aims to prevent worker fatigue and ensure that employees have sufficient rest and leisure time.

**Why Each Wrong Option is Incorrect**
**Option A:** There is no provision in the Factory Act that allows for a maximum of 60 hours of work per week. This would be detrimental to worker health and safety.

**Option B:** The Act does not specify a maximum of 72 hours of work per week. In fact, it emphasizes the importance of rest periods and adequate leisure time for workers.

**Option C:** The Act does not permit a maximum of 96 hours of work per week, which would be excessively taxing on workers and potentially hazardous to their health.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the Factory Act of 1948 is a critical piece of legislation that protects the rights and welfare of workers in India. Its provisions, including the maximum working hours per week, are designed to prevent worker exploitation and promote a healthy work-life balance.

**Correct Answer: D. 48 hours.**