Explanation:

- MGNREGA stands for Mahatma Gandhi National Rural Employment Guarantee Act.

- It aims to provide livelihood security in rural areas by guaranteeing wage employment.

- The Act assures at least 100 days of wage employment in every financial year to every rural household whose adult members volunteer to do unskilled manual work.

- Option 1: 50 days – This is not correct under MGNREGA.

- Option 2: 100 days – This is the correct answer as per the Act’s provision.

- Option 3: 200 days – Sometimes provided in drought-prone areas, but not the default guarantee.

- Option 4: 30 days – No such provision under MGNREGA.