Explanation:

Let’s break it down:

- Option 1: 1979 — That’s the year when the Planning Commission of India actually set up a Study Group specifically to look into poverty, under the leadership of Dr. Y.K. Alagh. This group is known for developing the official methodology for defining the poverty line in India. Correct Answer

- Option 2: 1989 — There’s no record of a major poverty study group being formed in this year by the Planning Commission.

- Option 3: 1962 — While the Planning Commission was active, there wasn’t a focused poverty study group formed this year.

- Option 4: 2005 — This is when planning really started to look seriously at broader issues around the National Rural Employment Guarantee Act, not the original poverty study group.

So, the right answer is 1979.