Read the passage carefully and answer the following questions.

Madhu is a 15-year old school dropout. She stopped going to school after failing in class VIII. Her father, a tailor, expired last year. He was suffering from Tuberculosis. This made it necessary for the children and their mother to work. Her elder brother aged 17 years works in a grocery shop and the younger one aged 14 years is engaged in chocolate packaging. Madhu and her mother roll bidis. Madhu started rolling bidis at an early age and she enjoys it as it provides her the opportunity to sit close to her mother and other women and listen to them chat. She fills tobacco into the rolled tendu leaves. She spends most of her time in this activity apart from the time spent doing household chores. Due to long hours of sitting in the same posture daily, she suffers from backache. Madhu wants to restart her schooling.

Madhu's work as a bidi worker is an example of:

Child labour

The correct answer is Option (2) → Child labour

Child labour is generally defined as work that is inappropriate for a child's age, mental or physical development, potential or school hours. At 15, Madhu is legally a child in most countries and should be in school. 

Here's why the other options are not correct:

* **Industrial labour:** This refers to work done in factories or large-scale production units. While bidi rolling can be done in workshops, it's not necessarily industrial in scale.
* **Free labour:** This refers to work done without any payment or coercion. Madhu likely receives payment for rolling bidis, so it's not free labour.
* **Abuse:** Abuse is a broader term that can encompass many things,  but child labour isn't necessarily abusive in all situations. However, it does deprive children of education and proper development