**Core Concept**
The Factory Act is a legislation that regulates the employment of children in factories, aiming to prevent child labor and ensure their safety and well-being. The act specifies the minimum age for employment in factories to protect children from hazardous working conditions.

**Why the Correct Answer is Right**
Although the exact correct answer is not provided, according to the Factory Act, the minimal cut off age for employment of children is typically **14 years**. This is because children below this age are considered too young to work in factories due to the potential health and safety risks. The act prohibits the employment of children below a certain age to ensure they receive adequate education and are protected from exploitation.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not match the typical minimum age specified by the Factory Act.
**Option B:** This option is also incorrect as it is lower than the standard minimum age.
**Option D:** This option is incorrect because it exceeds the typical minimum age threshold.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that child labor laws vary by country and region, but most legislation aims to protect children from exploitation and ensure they receive proper education. The Factory Act's minimum age requirement is a crucial aspect of these laws.

**Correct Answer:** C. 14 years.