3.
The answer is: A
Explanation
According to the Factories Act, 1948, the correct option is A: “child” means a person who has not completed his fifteenth year of age.
This definition is given in Section 2 (c) of the Act. A child who is 14 years or older can work in a factory only if they have a certificate of fitness from a certifying surgeon and carry a token referring to such a certificate while at work. The Act also prohibits the employment of children in certain hazardous processes and operations.