Explanation:

The First Indian Factories Act of 1881 focused specifically on:

- Option 1: Women labour - Although conditions and rights for women would be considered later, this Act's primary focus wasn't on women.

- Option 2: Living conditions of factory workers - The Act did not primarily address living conditions.

- Option 3: Child labour - This is correct. The Act primarily aimed to address child labour issues, including limiting the working hours for children and specifying a minimum age for employment.

- Option 4: Textile workers - While many early factories were textile mills, the Act wasn't specific to this sector.

Option 3 (Child labour) is the correct choice